The male protagonist begins to see the ghost of the "female protagonist". This "ghost" didn't speak, only watched coldly when he was making out with his new love, and sat across from him in tears when he signed the contract.
The male protagonist thought it was haunted and asked a master to exorcise the evil spirits, but found that only he could see it. The psychiatrist diagnosed this as an extreme hallucination caused by "post-traumatic stress disorder" - because he subconsciously loved her miserably.
Purpose: Don't do bad things, don't be afraid of ghosts knocking on your door.