707 (Real name Saeyoung Choi, Baptismal name Luciel Choi ) often referred to as Seven, is one of the Deep Story characters available in Mystic Messenger. He is a hacker who can quickly find information on anything he can get his hands on. Seven displays a happy-go-lucky, outgoing, and very bizarre personality in the chat room. But on the outside the chat room, and behind the humorous front he puts up, Seven is actually quite depressed and serious, and he refuses to believe that anything good can happen to him.