They say there's treasure buried on Shima Island, but Jungkook only has eyes for his beautiful neighbor; a cute crab enthusiast named Namjoon. - Jungkook wasn't looking forward to spending the summer up at his Uncle's place on Shima Island, since his friends were all going on a trip to Europe and Shima didn't have any working cell service. But that all changes when he sees the neighbors kid is spending the summer there too, and Jungkook quickly develops a crush on the boy, thinking maybe this summer won't be so boring after all. Before he can even make a move, however, there's a murder in the small harbor town, and despite the two boys being warned not to investigate anything, Namjoon insists they have to. And how can Jungkook resist a crime scene, an old legend about the island, rumors of a buried treasure, and Namjoon's adorable dimples?

Hoseok just wants everyone to be okay- especially his best friend Jungkook, who seems to have a talent for getting into trouble. Jungkook is the misunderstood younger brother who wants to be his own person and wishes everyone would stop comparing him to his successful older brother Namjoon. Namjoon is a responsible boy who wants to protect his childish younger brother, as well as everyone else in his town. Like the missing kid named Jimin. Jimin just wants to escape this hell, to get away from the psychopath killer who ripped out his vocal cords, and tell Seokjin it wasn't his fault. Seokjin wants the bodies to stop showing up on his doorstep. He knows it's impossible to save them, even though he's a doctor. He couldn't save Jimin, but he'll do his damnest to save Taehyung. Taehyung, an orphan with a very special book and an even more special secret talent, just wants to know who killed his parents, and get his revenge. And as for what Yoongi wants? Well, as a psychopathic killer, he wants Hoseok dead, wants the mighty and heroic Namjoon at his mercy, wants his hands on Jungkook, wants Jimin exactly where he has him, and wants to keep on tormenting Seokjin to his breaking point. Oh, and he DEFINITELY wants the secret ability Taehyung has. It's all a matter of who gets what they want first, and when everyone has an alter ego, you can't trust anyone; not even yourself.