
Valencia took him into their academy in July 2011, aged ten, and eight years later he left Poland with the Under-20 World Cup Golden Ball, two goals and four assists as Korea reached the final. Two Champions League titles followed with Paris Saint-Germain in 2025 and 2026, making him the second Korean to win it after Park Ji-sung, with three Ligue 1 crowns, two Coupes de France, the 2019 Copa del Rey and Asian Games gold in 2023. Career record: 29 caps and 10 goals for South Korea; club career at Valencia CF, RCD Mallorca, Paris Saint-Germain.
| 2012–2018 | Valencian Community autonomous football team |
| 2017–2019 | Valencia CF Mestalla |
| 2019–2021 | Valencia CF |
| 2021–2023 | RCD Mallorca |
| 2023–2026 | Paris Saint-Germain |
| 2026–today | Atlético Madrid |
| South Korea | 29 caps, 10 goals |
South Korea legends whose careers overlapped Kang-in's
One rank above: Lee Dong-gook at #15.
One rank below: Choi Jin-cheul at #17.
South Korea's editorial top five: Son Heung-min · Cha Bum-kun · Park Ji-sung · Hong Myung-bo · Kim Min-jae.