There's a hot new underground club in town...

but membership lasts an eternity.

It's summer break, and Yoona knows she should stay put in Dullsville until her immortal love returns. But when she decides to go after Luhan, she can't resist a visit to her favorite Goth-spot, The Coffin Club. Sneaking inside, Yoona is shocked to discover a secret door that leads to the entrance of another hidden club. There's something peculiar about this cryptic hangout---and it's too enticing for Yoona to resist. Soon a dangerous battle for the club's rule erupts between Luhan's old nemesis and a mysterious new guy. Can Yoona avoid the clash before her curiosity lands her in serious trouble?