Kim playing for South Korea at the 2019 AFC Asian Cup
On 13 January 2012, Albirex Niigata announced the signing of Kim Jin-su.[2] On 19 February 2012, Kim made his professional debut against Vissel Kobe in a pre-season friendly match, which Albirex won 3–0. Furthermore, he scored his first professional goal in the same match, with a long range strike.[3]
He made his competitive debut in a J1 League match against Kawasaki Frontale on 10 March 2012, playing the full 90 minutes.
On 20 July 2013, Kim made his debut for the South Korea senior team against Australia in a 0–0 draw. And South Korea ended in third place.
2014 Asian Games
Kim was selected for the football tournament at the 2014 Asian Games which was hosted by Korea Republic. His team won the final match in a 1–0 against North Korea, which guaranteed the entire squad's exemption from mandatory military service.
2018 World Cup
In May 2018 he was named in South Korea’s preliminary 28 man squad for the 2018 World Cup in Russia.[5] Kim Jin-su, who was uncertain about the 2018 World Cup finals due to injuries, was pushed out of the final competition for the 2018 World Cup in Russia.[6]
2017 & 2019 EAFF E-1 Football Championship
Kim Jin-su was selected to play in both 2017 and 2019 EAFF E-1 Football Championship. He played in both final matches which led them win the first place.
2019 AFC Asian Cup
In round 16 match, he scored a goal in 2–1 victory against Bahrain in overtime and the team advanced to quarter-final which later eliminated by Qatar, the eventual champion of 2019 AFC Asian Cup.
2022 World Cup
In 2022 FIFA World Cup, Kim Jin-su played full-time in all group stage matches and played in a last match against Brazil. He did an excellent job in the match against Uruguay. Despite being a goalless draw, there were plenty of good performances from his team and Kim Jin-su stood out. The 30-year-old veteran defender was impressive both offensively and defensively during the game. Overall, he made three tackles, one clearance, won five ground duels, four aerial duels and completed three crosses in the match.
He also assisted the second goal to Cho Gue-sung in a second match against Ghana on 28 November. Despite exit from the world cup, his team successfully advanced to the round of 16 which was achieved after 12 years.