To keep Tae Yi safe, Jin Gyeom and Tae Yi move into the house Jin Gyeom grew up in. The police focus on identifying the suspect who tried to kill Tae Yi and his accomplice. Back at Alice, Min Hyuk believes Lee Se Hoon might have the answers needed to find The Book of Prophecy, and Seok Oh Won remains missing. Later, Tae Yi finds an article by a mathematician, which uses the same approach in the equation left by the killer.