Dead Man's Letter
- Title: 망자의 서 / Mangjaui Seo
- Also known as: Book of the Dead / The Book of the Dead
- Genre: Mystery, suspense, thriller
- Episodes: TBA
- Broadcast Network: KBS2
- Broadcast Period: 2021-??-?? to 2021-??-??
- Air Time: TBA
- Original Soundtrack: Dead Man's Letter OST
Joo Ha Na, a once-famous judoka who became poor due to a string of unfortunate events in her life, asks her childhood friend Do Woo Ri to marry her and to fake his death. They were planning to flee the country after they obtained the insurance money, but things did not go as planned. Woo Ri is killed and Ha Na is charged with murder.
- Production Company: Mega Monster
- Executive Producers: Kim Yong Jin (김용진), Son Jae Sung (손재성)
- Chief Producer:
- Original writing: GAR2
- Based on the webtoon Dead Man's Letter (망자의 서), written by GAR2 and illustrated by Oh Saem (오쌤).
- The series was supposed to air in 2020. However, due to the after-effects of the coronavirus disease 2019 (COVID-19) pandemic (some scenes were to be shot in Thailand, which was also affected by the same situation), it was pushed back to 2021.