Korea broke the deadlock late — Hwang In-beom's 66th-minute finish came through the middle after Czechia's back five had spent the previous twenty minutes leaning left to cover Korea's repeated overloads on that side. Substitute Oh Hyun-gyu doubled the lead in the 79th minute, arriving with a run pattern Czechia hadn't seen from Son and finishing in the gap that opened while the Czech block was still recalibrating to the substitution. Czechia pulled a goal back later on but couldn't force a second, and Korea closed out a 2-1 win built on patient territorial control (55.8% possession, 63% field tilt) rather than moments of individual chance.

Lee Kang-in dropping deep wasn't simple support; it was the first link in a chain — stabilise the back, feed forward, then invite the third-line run. With Lee deep, Hwang In-beom and Baek Seung-ho were freed to push on; with Son pinning both centre-backs and the wing-backs stretching the full-backs, Lee's entries opened Czechia's half-space. His numbers back it: a team-leading 8 ball progressions and 12 In-Between (between-the-lines) movements — he was the relay between build-up and transition.

Korea's clearest attacking pattern was to overload one flank, then switch quickly to hit the other — made sharper by Czechia's back five. Son and Lee Jae-sung's advanced positioning, decoy runs and penetrations dragged the Czech block across; the space that opened was attacked by the free in-behind runs of Lee Jae-sung, Lee Tae-seok and Son, and by Lee Kang-in's diagonal switch passes. As the crossing pattern repeated, Czechia could no longer tell which side to defend — cross locations were balanced across both flanks, so space was created on both. Final-third receptions 125; crosses 13; ball progressions 27 to Czechia's 10.

Son's runs and Seol Young-woo's overlapping penetrations threatened in behind all game, steadily pushing the Czech line back; when Czechia dropped, the midfield opened and Hwang In-beom and Baek Seung-ho's third-line runs appeared — showing up as 14% final-third possession. Total movements 281, of which 70 were Final-Third In-Behind runs. The regret: Son — so dangerous in behind and in front of goal — was used mainly as a pressing tool to win second balls off long build-up, rather than being fed higher up with more numbers and more precise passes to release his speed and finishing.

On losing the ball, Lee Jae-sung and Son led an immediate front press, deliberately forcing the Czech goalkeeper long; the back three then stepped up to cut those long balls out and the cycle reset into a mid-block. Even in the block the stoppers stepped forward aggressively, covering the ambiguous zone between winger and third line to erase second balls and the opponent's half-space — pro-active defence, not passive line-holding. The headline number is ball-recovery time: Korea 12.78s to Czechia's 18.42s. Kim Min-jae's team-leading 9 possession recoveries and 30 forced turnovers came from that pre-emptive occupation, not from a passive block.

Lee Kang-in settling into the base of the 3-2 build is a mutation: one move creates numerical superiority in front of the back line, frees Hwang and Baek from the pivot layer, and widens the two stoppers' involvement — Korea becomes a different team. It is also a Lure & Shock at match scale: Korea repeated the left-side combination and Son's left runs (unpressed build 38% — the Lure) until Czechia's five leaned left, then struck through the centre — Hwang In-beom's 66' opener. The substitutions were a second Shock: Oh Hyun-gyu (on 69') ran a completely different pattern from Son, voiding 69 minutes of Czech learning, and his 79' goal came straight out of that re-learning gap. When Lee Kang-in, Hwang In-beom and Oh Hyun-gyu fired as variables at once, Czechia could fully close none of them — the essence of variation.