Fatal promise charts the outcome of a broken promise between Cha Eun-dong (Park Ha-na) and Kang Tae-in (Ko Se-won) that has a devastating impact on those around them.
| Also Known As: | Dangerous Promise |
| Directed by: | Kim Shin-Il |
| Written by: | Ma Joo-hee |
| Starring: | Park Ha-na, Go Se-won, Kang Tae-sung, Park Tae-in, Lee Chang-wook |
| Extended Cast: | Lee Dae-yeon, Kang Shin-Il, Song Min-hyung, Kil Yong-woo, Park Young-din, Lee Kan-hee, Kim Na-woon, Yoon Bok-in, Oh Young-sil, Kim Hye-ri |
| Original network: | KBS2 |
| Original release: | 30 March 2020 |
| No. of episodes: | 16 |
| Distributor: | KBS2 |
