Paper Hearts: MinChan/SeungIn/Hyunlix/Changsung

Lee Minho an introverted, Artsy University student finds a blank sketchbook hidden somewhere in the house that might have belonged to his mother. Within the book, he draws his imaginary comfort character who is everything he needs in a person.
The next day he finds a handsome man sitting on the couch in his living room eating a snack. He claims to have come out of the book. On top of being confused about the person from the sketch, he doesn't believe the intimidating-looking man but he lets him stay with him if he promises to help him with his real life problems...