Koh Yoo possesses the unique ability to see memories from the last whenever he smells something linked to them. However, this gift comes with a dangerous flaw: whenever Yoo is drawn into these memories, his consciousness leaves his body in a dazed and defenseless state. One day, he narrowly avoids getting hit by a car thanks to Lee Yoohan, who jumps in to save him. To Yoo’s surprise, he discovers that when Yoohan is near, he can see scents as physical forms, allowing him to avoid being pulled into memories. As the two grow closer, Yoo begins to navigate his abilities with Yoohan's unexpected help, but lingering questions about their connection remain.