At most, notorious gangster Bang Yongguk was expecting a decent apprentice when he picked sobstory orphan Daehyun off the streets. The last thing he expected, however, was to find love in the boy's broken eyes. He knows he needs to teach him the things that will save his life; how to fire a gun, how to kill mercilessly, how to be a successful thief, but tainting him seems so wrong to the older boy, and the guilt will stay with him forever.