| French Open | 10/27 14:35 | 5 | Kwang Hee Heo v Viktor Axelsen | - | Retired | |
| Denmark Open | 10/19 13:45 | 5 | Kanta Tsuneyama v Kwang Hee Heo | L | 2-1 | |
| Thomas Cup | 10/15 06:30 | - | Kwang Hee Heo v Kento Momota | W | 2-0 | |
| Thomas Cup | 10/13 17:00 | - | Viktor Axelsen v Kwang Hee Heo | L | 2-0 | |
| Thomas Cup | 10/11 17:00 | - | Kwang Hee Heo v Toma Junior Popov | W | 2-1 | |
| Thomas Cup | 10/09 17:00 | - | Kwang Hee Heo v Max Weisskirchen | W | 2-0 | |
| Sudirman Cup | 10/02 07:30 | - | Yu Qi Shi v Kwang Hee Heo | L | 2-1 | |
| Sudirman Cup | 10/01 07:30 | - | Kwang Hee Heo v Kunlavut Vitidsarn | W | 2-1 | |
| Sudirman Cup | 09/30 08:00 | - | Tien Chen Chou v Kwang Hee Heo | W | 1-2 | |
| Sudirman Cup | 09/26 13:20 | - | Kwang Hee Heo v Max Weisskirchen | W | 2-1 | |
| OS 2020 - Herrar | 07/31 00:00 | 3 | Kwang Hee Heo v Kevin Cordon | L | 0-2 | |
| OS 2020 - Herrar | 07/28 11:00 | 1 | Kento Momota v Kwang Hee Heo | W | 0-2 | |
| OS 2020 - Herrar | 07/26 09:40 | 1 | Kwang Hee Heo v Timothy Lam | W | 2-0 | |
| Thailand Open | 01/20 03:00 | 5 | Kwang Hee Heo v Tzu Wei Wang | L | 0-2 | |
| Thailand Open | 01/12 03:00 | 5 | Anthony Sinisuka Ginting v Kwang Hee Heo | L | 2-1 | |
| All England Open | 03/11 11:35 | 5 | Kanta Tsuneyama v Kwang Hee Heo | L | 2-1 | |
| Asia Team Championships | 02/14 08:00 | - | Kwang Hee Heo v Zii Jia Lee | L | 0-2 | |
| Asia Team Championships | 02/12 08:00 | - | Anthony Sinisuka Ginting v Kwang Hee Heo | L | 2-1 | |
| Thailand Masters | 01/24 08:00 | 3 | Kwang Hee Heo v Ka Long Angus NG | L | 1-2 | |
| Thailand Masters | 01/23 10:10 | 4 | Kwang Hee Heo v Zii Jia Lee | W | 2-1 | |
| Thailand Masters | 01/22 04:30 | 5 | Kwang Hee Heo v Misha Zilberman | W | 2-0 | |
| Indonesia Masters | 01/16 05:10 | 4 | Kwang Hee Heo v Cheuk Yiu Lee | L | 1-2 | |
| Indonesia Masters | 01/15 07:50 | 5 | Kwang Hee Heo v Brice Leverdez | W | 2-1 | |
| Indonesia Masters - Kval | 01/14 08:00 | - | Kwang Hee Heo v Suppanyu Avihingsanon | W | 2-0 | |
| Malaysia Masters - Kval | 01/07 07:10 | - | Kwang Hee Heo v Hans-Kristian Vittinghus | L | 0-2 | |
| Syed Modi Int. | 11/30 10:10 | 2 | Sourabh Verma v Kwang Hee Heo | L | 2-1 | |
| Syed Modi Int. | 11/29 09:30 | 3 | Jun Peng Zhao v Kwang Hee Heo | W | 1-2 | |
| Syed Modi Int. | 11/28 08:40 | 4 | Kwang Hee Heo v Siril Verma | W | 2-0 | |
| Syed Modi Int. | 11/27 11:40 | 5 | Kwang Hee Heo v Kai Schaefer | W | 2-0 | |
| Korea Masters | 11/21 06:30 | 4 | Dan Lin v Kwang Hee Heo | L | 2-1 |