| Korea Masters 2019, MS, Qualification | 11/07 03:10 | - | Son, Wan Ho v Lee, Dong Keun | D | Retired | |
| Korea Masters 2019, MS, Qualification | 11/07 01:00 | 4 | Choi, Ji Hoon v Lee, Dong Keun | W | 1-2 | |
| Korea Open 2019, MS, Qualification | 07/18 04:00 | - | Son, Wan Ho v Lee, Dong Keun | L | 2-1 | |
| Korea Open 2019, MS, Qualification | 07/18 01:00 | - | Kim, Dong Hoon v Lee, Dong Keun | W | 0-2 | |
| Malaysia Masters 2020, MS, Qualification | 07/05 06:20 | - | Lee, Dong Keun v Tze Yong Ng | L | 0-2 | |
| Malaysia Masters 2020, MS, Qualification | 07/05 02:20 | - | Lee, Dong Keun v Elgamal, Adham Hatem | W | 2-0 | |
| Korea Masters | 04/13 01:20 | 5 | Lee, Dong Keun v Guang Zu Lu | L | 0-2 | |
| Korea Open | 04/06 03:30 | 5 | Jan Louda v Lee, Dong Keun | L | 2-0 | |
| Welsh Int | 12/03 17:40 | - | Verma, Siril v Lee, Dong Keun | L | 2-0 | |
| Welsh Int | 12/03 12:00 | - | Lee, Dong Keun v Varun Kapur | W | 2-1 | |
| Welsh Int | 12/02 13:40 | - | Lee, Dong Keun v Alap Mishra | W | 2-1 | |
| Scottish Open | 11/26 17:40 | - | Arnaud Merkle v Lee, Dong Keun | L | 2-0 |