1.FSV Mainz 05Lee has not won major club trophies but played a pivotal role in Holstein Kiel's historic promotion to the Bundesliga in 2021. Individually, he has been recognized as one of the top Asian players in the Bundesliga and has represented South Korea in multiple World Cup qualifiers and Asian Cup tournaments.
Jae-sung Lee is a South Korean attacking midfielder who has spent the majority of his career at 1.FSV Mainz 05 in the Bundesliga. He joined Mainz in 2021 after a successful stint with Holstein Kiel, where he helped the club reach the Bundesliga for the first time. Known for his technical ability and creativity, Lee has been a key player for both club and country, earning over 70 caps for South Korea.
Lee is a technically gifted attacking midfielder known for his excellent dribbling, vision, and passing range. He excels at finding pockets of space between the lines and creating scoring opportunities for teammates, though his physicality and defensive contributions can be inconsistent. His ability to operate as a playmaker or secondary striker makes him a versatile tactical asset.
| Season | Comp | Apps | G | A | YC | RC | Min |
|---|---|---|---|---|---|---|---|
| 25/26 | UEFA Conference League | 7 | 1 | 2 | 0 | 0 | 336 |
| 25/26 | Bundesliga | 28 | 4 | 2 | 4 | 0 | 2201 |
| 25/26 | International Friendlies | 7 | 0 | 1 | 1 | 0 | 368 |
| 25/26 | UEFA Conference League Qualifying | 2 | 1 | 0 | 0 | 0 | 172 |
| 25/26 | DFB-Pokal | 2 | 0 | 0 | 0 | 0 | 75 |
| 24/25 | Bundesliga | 33 | 7 | 8 | 4 | 0 | 2666 |
| 24/25 | DFB-Pokal | 1 | 0 | 1 | 0 | 0 | 111 |
| 23/24 | World Cup qualification Asia | 16 | 5 | 3 | 1 | 0 | 1062 |
| 23/24 | Bundesliga | 29 | 6 | 4 | 6 | 0 | 2128 |
| 23/24 | International Friendlies | 5 | 1 | 1 | 0 | 0 | 360 |
| 23/24 | DFB-Pokal | 2 | 0 | 0 | 0 | 0 | 139 |
| 22/23 | Bundesliga | 34 | 7 | 4 | 2 | 0 | 1904 |
| 22/23 | International Friendlies | 5 | 0 | 1 | 0 | 0 | 312 |
| 22/23 | DFB-Pokal | 2 | 0 | 0 | 0 | 0 | 110 |
| 21/22 | Bundesliga | 27 | 4 | 3 | 3 | 0 | 1449 |
| 21/22 | International Friendlies | 0 | 0 | 0 | 0 | 0 | 0 |
| 21/22 | DFB-Pokal | 3 | 0 | 0 | 1 | 0 | 178 |
| 2025 | East Asian Football Championship | 0 | 0 | 0 | 0 | 0 | 0 |
| 2023 | AFC Asian Cup | 6 | 0 | 0 | 1 | 0 | 437 |
| 2022 | World Cup | 3 | 0 | 0 | 0 | 0 | 215 |
| 2022 | East Asian Football Championship | 0 | 0 | 0 | 0 | 0 | 0 |
| 2019 | East Asian Football Championship | 0 | 0 | 0 | 0 | 0 | 0 |
| 2019 | AFC Asian Cup | 1 | 0 | 0 | 0 | 0 | 86 |
| 2018 | K League 1 | 17 | 4 | 4 | 0 | 0 | 954 |
| 2018 | Korea Cup | 0 | 0 | 0 | 0 | 0 | 0 |
| 2018 | World Cup | 3 | 0 | 1 | 1 | 0 | 270 |
| 2018 | AFC Champions League (- 2024) | 8 | 1 | 2 | 0 | 0 | 663 |
| 2017 | K League 1 Final A | 5 | 2 | 4 | 1 | 0 | 450 |
| 2017 | K League 1 | 23 | 6 | 6 | 1 | 0 | 1887 |
| 2017 | Korea Cup | 0 | 0 | 0 | 0 | 0 | 0 |
| 2017 | East Asian Football Championship | 3 | 1 | 2 | 0 | 0 | 252 |
| 2016 | K League 1 Final A | 4 | 1 | 3 | 0 | 0 | 304 |
| 2016 | K League 1 | 28 | 2 | 9 | 6 | 0 | 2475 |
| 2016 | Korea Cup | 1 | 0 | 0 | 0 | 0 | 90 |
| 2016 | AFC Champions League (- 2024) | 13 | 1 | 6 | 1 | 0 | 1138 |
| 2015 | K League 1 Final A | 5 | 2 | 0 | 0 | 0 | 450 |
| 2015 | K League 1 | 29 | 5 | 4 | 2 | 0 | 2465 |
| 2015 | Korea Cup | 1 | 0 | 0 | 0 | 0 | 22 |
| 2015 | East Asian Football Championship | 3 | 0 | 1 | 0 | 0 | 193 |
| 2015 | AFC Champions League (- 2024) | 9 | 2 | 2 | 0 | 0 | 810 |
| 2014 | K League 1 Final A | 5 | 0 | 1 | 0 | 0 | 450 |
| 2014 | K League 1 | 21 | 4 | 0 | 1 | 0 | 1876 |
| 2014 | Korea Cup | 3 | 0 | 1 | 0 | 0 | 152 |
| 2014 | Asian Games | 2 | 0 | 0 | 0 | 0 | 203 |
| 2014 | AFC Champions League (- 2024) | 7 | 1 | 1 | 1 | 0 | 570 |
| 2013 | Korea Cup | 1 | 0 | 0 | 0 | 0 | 90 |
| 2012 | Korea Cup | 1 | 0 | 0 | 1 | 0 | 90 |
| 2011 | Korea Cup | 1 | 0 | 0 | 0 | 0 | 38 |
| 20/21 | 2. Bundesliga | 33 | 5 | 6 | 1 | 0 | 2804 |
| 20/21 | Bundesliga Playoffs | 2 | 1 | 1 | 0 | 0 | 180 |
| 20/21 | International Friendlies | 2 | 0 | 0 | 1 | 0 | 126 |
| 20/21 | DFB-Pokal | 5 | 2 | 0 | 0 | 0 | 451 |
| 19/20 | World Cup qualification Asia | 15 | 1 | 4 | 0 | 0 | 1195 |
| 19/20 | 2. Bundesliga | 31 | 9 | 8 | 2 | 0 | 2733 |
| 19/20 | International Friendlies | 1 | 0 | 0 | 0 | 0 | 76 |
| 19/20 | DFB-Pokal | 2 | 1 | 1 | 0 | 0 | 189 |
| 18/19 | 2. Bundesliga | 29 | 5 | 9 | 2 | 0 | 2317 |
| 18/19 | International Friendlies | 6 | 2 | 0 | 0 | 0 | 339 |
| 18/19 | DFB-Pokal | 2 | 0 | 1 | 0 | 0 | 96 |
| 17/18 | International Friendlies | 10 | 1 | 0 | 0 | 0 | 762 |
| 16/17 | World Cup qualification Asia | 5 | 0 | 0 | 0 | 0 | 264 |
| 16/17 | FIFA Club World Cup | 2 | 0 | 1 | 0 | 0 | 180 |
| 16/17 | International Friendlies | 1 | 0 | 0 | 0 | 0 | 26 |
| 15/16 | International Friendlies | 2 | 0 | 1 | 0 | 0 | 97 |
| 14/15 | World Cup qualification Asia | 7 | 3 | 2 | 0 | 0 | 408 |
| 14/15 | International Friendlies | 4 | 1 | 0 | 0 | 0 | 264 |
| 07/08 | International Friendlies | 1 | 0 | 2 | 0 | 0 | 80 |