Season 1 of The Lost Soul premiered on May 20, 2022.

After a failed operation to capture the infamous drug dealer, Jiang, Investigator Techit finds himself traveling to his friend Sritang's resort in order to take a break. There, he meets a sweet-voiced ghost who haunts his room and can not remember anything about her past. He decides to call her Siangwaan because of her pretty voice, and the two then begin to find out her real identity.