Saen Saep Nak Suep Phee Sing

The sharp-witted detective San Saeb has opened a spiritual medium shrine under the alias "Pu Kham Saen Roo." He poses as a possessed medium to perform exorcisms, ease the villagers' suffering, and conduct undercover investigations. His reputation has spread nationwide; whenever a case remains unsolved, the victims flock to his shrine to ask "Pu Kham Saen Roo" for help.
Once a case is accepted, San Saeb immediately begins his investigation with the help of two assistants:

• Phrai Hak Muk: A female ghost and former tree spirit who inhabits a Hak Muk banana tree.
• Jing Jang: A beautiful and sexy young journalist who can dig up information with incredible speed.

A comedic rivalry exists between the two, as Phrai Hak Muk is constantly jealous of Jing Jang. San Saeb makes it clear that he sees Jing Jang as the future mother of his children. In fits of extreme jealousy, Phrai Hak Muk often possesses San Saeb’s body just to play pranks on Jing Jang, which frequently derails their work and leaves San Saeb deeply frustrated.
Once the investigation is complete and the culprit is identified, San Saeb returns to his role as the medium to reveal the truth to the victims so they can alert the police. Often, the victims are skeptical that the accused is the real criminal. However, once Pu Kham Saen Roo gives his word and magically "summons" the evidence right before their eyes, everyone is convinced, leading to the eventual arrest of the villain.
(Source: broadcastthai.com)