Episode 5

S1, E5: When Mu Jin's father grows suspicious that his wife is having an affair, he asks Mu Jin to look into it. But during his visit, Mu Jin encounters the ghost of his mother's close friend, who pleads for justice. As he follows his mother to the university she secretly attends, Mu Jin stumbles upon a mysterious exam that may hold the key to uncovering the truth behind the ghost's tragic death.