Season 1 of Mungkorn Chao Phraya premiered on February 14, 2020.

Mike is half-Thai half-Hong Konger. Fang and Mike dated before and their fathers were close friends. After they broke up, Fang returned to Thailand and become a teacher and kindergarten owner. After Mike's father is killed, he also returned to Thailand to investigate the case. Police officer Tom is assigned to handle the case but Mike does not trust Thai police, so he does his own investigation. Both Mike and Tom are fighting for Fang.