Lee Jae-sung grew up in Ulsan, South Korea, and began his career at Jeonbuk Hyundai Motors, winning K League titles and the 2016 AFC Champions League, before moving to Germany with Holstein Kiel in 2018.
He joined Mainz 05 in 2021 and became a key attacking midfielder known for his intelligence and pressing. He is a regular for South Korea and played at the 2018 and 2022 World Cups.
Career in numbers
Jae-sung’s senior club career, which began in 2014, has so far brought 460 appearances and 84 goals for 3 clubs. The 2019/20 season, with 10 goals from 33 matches for Holstein Kiel, remains his highest tally. His busiest campaign was 2016, with 48 appearances. So far in 2026/27 he has made 5 appearances for Mainz 05. The full season-by-season record is in the Stats section of this profile.