Influenced by his sibling, he began playing football as a hobby in Anyang, Gyeonggi, before being scouted by Sinjeong Elementary School.

[2] Kang played in the selection match to qualify for the 2018 Volkswagen Junior World Masters tournament, where he was bestowed a trophy for being the top scorer.

[7] Kang scored his debut league goal in FC Seoul's match against Incheon United in July.

[9] Kang played for the South Korea U-17 football team, where he scored eleven goals in seven matches.

A judge of the Futures Star Awards highlighted Kang's "exceptional" physical energy and felt that he excels among others in his age group.