Vietnam U23 vs South Korea U23 in the 2026 Asian Games quarter-final: The unnamed weapon and the memory of January's shootout

Minute 27

In the 27th minute of South Korea U23's match against Saudi Arabia U23, Lee Gi Hyuk stayed down on the grass after a collision. The ball had long gone out of play. There was a bruise across the shin of the centre-back wearing the captain's armband, and on the bench nobody stood up to prepare a substitution. He got up on his own, tested a few steps, and played the whole match. South Korea U23 won 2-0, took top spot in Group D, and kept intact a man the coaching staff knew they would need in the next round.

At another stand of the 2026 Asian Games in Japan, there is an empty seat. Head coach Kim Sang Sik is not sitting on the Vietnam U23 bench. Korean media noted that detail in a single sentence, almost without comment. For those who have followed Vietnamese youth football long enough, that absence says more than any squad list: the team enters the quarter-final without its familiar figure on the touchline, without Dinh Bac in attack, and without several key faces in defence.

I rewound the footage of minute 27 three times. Not to watch the collision, but to watch how a reigning champion handles its own anxiety.

Two squads moving in opposite directions

At 17:30 on 25 September, Vietnam U23 meet South Korea U23 in the quarter-final of the men's football tournament at the 2026 Asian Games. It is a reunion seven months in the making. At the 2026 AFC U23 Asian Cup in Saudi Arabia in January, the two sides drew 2-2 after 120 minutes in the third-place play-off, and Vietnam U23 won 7-6 on penalties.

But football does not live on old footage. Since January, the two teams have changed in different directions, and the gap is far wider than a 2-2 draw suggests.

South Korea U23 added nine players currently playing in Europe along with three overage players. That is the squad structure of a team that wants to win the title, not one that wants to go as far as it can. They beat Qatar U23 4-1 and Saudi Arabia U23 2-0, reaching the quarter-finals as Group D winners without ever trailing in this tournament.

Vietnam U23 have gone the other way. The team lost Dinh Bac and several key defenders, and come into this match off a defeat to Uzbekistan U23. A side that loses its best attacking spearhead and, at the same time, several links in its back line, must rewrite almost the entire match plan: how to escape pressure, how to keep the distances between the lines, and how to counter with only one runner ahead of the ball.

That is why captain Lee Gi Hyuk's remarks in The Chosun deserve closer reading than their polite surface suggests: "Vietnam U23 have just suffered a defeat to Uzbekistan U23. So they will come into the quarter-final with enormous determination. Therefore I reminded my team-mates that we must not be careless and must maintain a high level of concentration at all times."

Lee Gi Hyuk, a Gangwon FC player, can operate as a centre-back or a defensive midfielder. He bruised his shin in the 27th minute against Saudi Arabia U23 but played the full match, and is fully available to face Vietnam U23.

Korean media go further than one player. Sports Hankook warned: "Even though coach Kim Sang Sik is not on the Vietnam U23 bench, South Korea U23 absolutely must not be complacent." The outlet pointed to pragmatic defending, intense pressing in midfield and quick counter-attacks into the space on both flanks as Vietnam U23's weapons, and judged that what makes this opponent dangerous lies in its durable physical base and relaxed mentality rather than in the reputations of its players.

A defence rebuilt from scratch

Losing several key figures in the back line during a short tournament is the kind of loss outsiders tend to underrate. At U23 level, a defence does not run on names, it runs on habit: the distance between two centre-backs when one steps up, the drop rhythm of the holding midfielder, the running angle of a full-back when the opponent switches the point of attack. Those things take dozens of training sessions to become reflex, and no training session can reproduce the real speed of an Asian Games quarter-final.

The absence of head coach Kim Sang Sik from the bench makes that problem one degree harder. A newly assembled defence needs someone constantly correcting it on the touchline — shift three metres, push the line up, drop it back, close the gap between full-back and centre-back. Those adjustments only work if they are spoken in two seconds, just before the ball is played.

But this is where I read the game differently from most pre-match predictions. A defence short of bodies is sometimes a clearer defence. When there are no longer enough individuals to press high and contest every metre, a team is forced to choose a low, unified block and to abandon risky interceptions. That simplicity, in a match where the opponent is stronger in every position, can be a genuine advantage.

At the other end, South Korea U23 must solve a different problem: how to pull a crowded defensive block out of position without pushing themselves into a losing position in midfield.

Thirty seconds after losing the ball

Sports Hankook called intense midfield pressing Vietnam U23's weapon. I want to make that concrete, because pressing is not a posture, it is a period of time.

A good pressing team is not the one that runs the most. It is the one that wins the ball back within roughly thirty seconds of losing it. In that window, the opponent has not yet settled into an attacking shape, the lines are still far apart, and a tackle in the opposition half is worth far more than one on the edge of your own box.

For Vietnam U23, with Dinh Bac absent, the value of winning the ball early multiplies. Without a spearhead quick enough to race Korean centre-backs across open ground, the team must shorten the distance from the point of recovery to the goal. It is simple arithmetic that many overlook: ten metres less means one touch less, and one touch less means the opposing defence has not yet dropped.

But there is a condition attached. With a defence that has just lost men, the pressing must have selective triggers rather than being collective. The most logical trigger is a sideways pass towards a Korean full-back, or a receiver taking the ball with his back turned in the inside channel. If Vietnam U23 press all three lines at once, the space behind the holding midfielder opens immediately, and with nine players based in Europe, South Korea U23 can turn defence into attack in two passes.

Having followed Vietnamese youth football for years, I have noticed that our youth teams often win on inspiration and lose on distance discipline. This quarter-final is the reverse test: inspiration can come from one counter-attack, but distance is what decides how long a team stays standing.

The flanks and the price of pushing high

South Korea U23, with nine Europe-based players and three overage selections, will push their full-backs very high. That is the inevitable consequence of a side that wants to control the ball and create numerical superiority in the inside channels. The price sits in the space behind those two full-backs.

At the 2026 AFC U23 Asian Cup in January, South Korea U23 paid exactly that price: two goals conceded in 120 minutes, and ultimately a 6-7 defeat on penalties. Sports Hankook still points to that same weakness when describing Vietnam U23's quick counters into the wide channels. A sports daily in Seoul repeating that tactical detail before the quarter-final means the South Korean coaching staff have watched the January footage more often than they would like to admit.

For Vietnam U23, the wide counter-attack now comes with a new obstacle. Having lost their best spearhead, the team no longer has someone who can hold the ball long enough to wait for team-mates. Counters will have to be shorter, more direct, and will often end with a shot from outside the box or a corner. That is why set pieces become unusually important here: against a high Korean defensive line, every corner is a chance for Vietnam U23 to put the ball into the box without running.

A bruise, three overage slots and an agent's notebook

The Asian Games is a major marketplace for youth football, and this year it coincides with the transfer window. In the stands, next to the scouts, there is no shortage of agents opening notebooks for every phase of play.

The striking thing is that those notebooks are recording numbers that drift further and further from on-pitch reality. A player who has not even played 50 top-level matches can be valued at 100 million euros, while someone who has played a full 120 minutes in a continental third-place play-off is still looking for a club. The youth valuation bubble has not deflated, and it is shaping how youth teams build squads: buy potential, sell potential, and forget that a quarter-final is decided by things nobody prices.

South Korea U23's three overage slots are the counter-example. Lee Gi Hyuk of Gangwon FC is not on the list of the tournament's most expensive names. He is the man who played a full match with a bruised shin, and the man who reminded his young team-mates to stay focused. Teams that win short tournaments always need a few people like that: unspectacular, but still on the pitch at the moment it matters.

In the same vein, I want to talk about the goalkeeper position. Distribution has been sanctified over the past few years to the point where many youth teams pick their keeper by passing metrics, while basic reflexes — the only thing that saves a team inside the box — decline. Against a South Korea U23 side that shoots early and often, a goalkeeper's real value lies in the first save, not the tenth pass.

The memory of a shootout does not live in the legs

On 25 September, something will walk onto the pitch with both teams that nobody can see: the memory of the 7-6 shootout in Saudi Arabia in January.

Penalties are a game of chance, but the memory of them is not. A team that lost such a shootout enters the next meeting with a different appetite for risk. They may play tighter in the first 20 minutes, keep more possession in their own half, and avoid the kind of duel that leads to a set piece. For Vietnam U23, that creates a familiar window: cede the ball in the first half, hold the score, then accelerate once the opponent begins to fret.

The Korean captain told the press that Vietnam U23 will come out with enormous determination. That is true, but it says less about the opponent than about his own team. A reigning champion having to remind itself to stay focused against a side that has just lost players and just lost a match is a team still carrying the memory of its own January.

There are quiet afternoons in empty stadiums when the sound of a bouncing ball feels like a confession that was never answered. The shootout in Saudi Arabia was one such afternoon — for the other side.

The real worry lies elsewhere

The Korean media's caution is not a courtesy line to please an opponent. It is a scouting report written by people who have rewatched the January footage. When a sports daily in Seoul devotes a whole passage to Vietnam U23's durable physical base, it is telling its readers something else: this match may run long, and their team may have to run more than planned.

But Vietnam U23's biggest worry lies elsewhere, and it is rarely mentioned. With an already thin defence, the question is not whether Vietnam U23 can withstand pressure in the first 30 minutes. The question is who, after the 70th minute, when a low block begins to feel heavy in the legs, will keep the distances intact in the inside channels.

The "nothing to lose" narrative is repeated too often before every Vietnamese match, and it has worn thin. Vietnam U23 have plenty to lose: a place in the Asian Games semi-finals, the momentum of a generation, and the faith of fans who have waited years for a youth team that can compete on the continental stage. A relaxed mentality is a real weapon, but turning it into an excuse breaks the weapon itself.

The counter-intuitive point of this match sits here: the team with the greater psychological advantage is not the one rated lower, but the one that handles the first 20 minutes after kick-off better. A low block that keeps a clean sheet until the 30th minute sends the memory of January back towards South Korea. An early goal conceded forces Vietnam U23 to open up, and that is the only scenario in which the gap in quality becomes absolute.

There is one more thing few notice. Twelve new faces — nine Europe-based players and three overage selections — is a major addition, but in a short tournament that addition is also a cost in cohesion. The South Korea U23 side that lost on penalties in January had been assembled over a longer period. The current side is stronger on paper, but not necessarily more synchronised over 90 minutes.

What matters more than the scoreline

I look into the gap between two passages of play, and I see a whole lifetime change in time. For Vietnamese football, the quarter-final on 25 September is not merely a reunion with the reigning champion. It is a measurement of whether this football nation has produced a way of playing distinctive and disciplined enough to survive even without its best player.

I once thought I was a storyteller. It turns out I only copy out the dreams of thousands of people. And the dream those thousands are sending into this team is not a win at any cost against South Korea U23. It is that, in the 90th minute, the team is still standing in exactly the positions the coaching staff set out, still clear-headed enough to choose a pass instead of a desperate shot.

They do not need me to paint them rosy. They need me beside them when the flag has faded.

At 17:30 on 25 September in Japan, when the ball rolls, the team that walked the opposite road will know where it stands. And as Vietnamese fans, we should ask ourselves a different question: if Vietnam U23 leave the 2026 Asian Games with a defence rebuilt from scratch and a plan executed for a full 90 minutes, is that still a defeat?