Secret(2010)

Secret is a Japanese drama series that follows a mother and daughter caught in a tragic bus accident. Naoko dies in the crash, but her spirit mysteriously inhabits her daughter Monami's body. Together with Monami's father Heisuke, they navigate the strange new reality of living as one person, grappling with grief, identity, and the complications of their impossible situation. As the family attempts to rebuild their lives, Heisuke grows suspicious about the accident's true cause and begins his own investigation. The series blends supernatural elements with family drama, exploring themes of loss, connection, and the secrets that bind families together.