Hannah has a vision of her boyfriend's death on the same night he's murdered. Sean, bored with his waking life, can't wait to escape into his lucid dreams. And Noah, a struggling composer, begins to lose his grasp on reality. The lives of these three strangers are about to collide in the mysterious world of lucid dreaming.

As a man makes a routine video call to his wife, the reality of their relationship becomes clear.

A year after Ruri's death, unaware of the truth, Mirae still resents Haru, who was with Ruri when she died. On Ruri's anniversary, Mirae visits their old hideout—a place full of memories—and unexpectedly meets Haru. There, she learns Ruri had gone to Itaewon to buy costume materials to surprise her. Through this encounter, Mirae and Haru begin to understand each other's pain and start to heal together.