"I want you to find me, and save me."  Mark finds a letter containing these words, only to realize that it was from Jinyoung. Doing as the letter told, he, and and the rest of his friends went out on a search to find Jinyoung. About six years later, they still haven't found him. Until one day, Yugyeom stumbles upon Jinyoung, only to find out that he doesn't know any of them.