The Smile Has Left Your Eyes

A weary detective contemplates quitting his job and takes on the murder case of a female university student that was disguised as a suicide. He becomes obsessed with solving it. He has a younger sister who meets a man who cannot remember his childhood. He is not a good person, but she feels sympathy for him. The detective tries to push the man away from his sister, suspecting the man is somehow involved in the female university student's murder case. The man and the detective's younger sister fall in love.