One night with his friends, Choi Beomgyu stumbles upon a mysterious silver capsule in the woods containing a naked, blue-blooded doppelgänger of himself. After a violent confrontation, he wakes up in 1986-trapped in the life of Ben, a guy who looks exactly like him. In this alternative universe, his friends have different names and inverted personalities, but same face, same body. His childhood home is eerily preserved, frozen in the aesthetics of the 80s. And worst of all, his best friend Ryujin, now called Joanne, acts like his clingy girlfriend, something the real Ryujin would never do. Will Beomgyu find a way back to his own world, or is he doomed to become the next Ben, trapped forever in a past that was never his?