Eun-Seol unexpectedly runs into her high school ex, U-Hyeon, after years of separation. Their reunion quickly becomes awkward, but after some drinks, the tension fades, and a drunken kiss leads to a night at a motel. The next morning, Eun-Seol panics, unable to remember the night. As she tries to move on, she’s confronted by her past when she runs into her ex. Will she overcome the past and rekindle things with U-Hyeon?