Phantom the Secret Agent

A romance drama that tells the love stories of four people: Min Joo, Kang Chan, Hee Yun, and Hyun Bum who are high school best friends. The story starts when Min Joo who has a one-sided love for Kang Chan begins to have the soul of her dead brother Dae Yun entering her body. Dae Yun will try to seduce Kang Chan to fulfill his younger sister's long time one-sided love.