A chance encounter with a mysterious beggar leaves Luna and Han-byeol with an ordinary-looking piece of candy that turns their lives upside down. After eating it, the two best friends mysteriously exchange bodies, forcing them to live each other’s lives while desperately hiding the truth from everyone around them.

Their impossible situation becomes even more complicated when both Luna and Han-byeol develop feelings for Wooju. As each experiences him from a different body and a different perspective, loyalty gives way to confusion, and the friendship they once believed was unbreakable begins to fracture.

With their identities tangled and their hearts pulling them in opposite directions, Luna, Han-byeol, and Wooju are drawn into an emotional triangle where love, trust, and destiny collide. Was the body swap a cruel twist of fate, or an unexpected chance to discover who they truly belong with?