When childhood friends Dojin and Hyeonoh go out to a mixer, they get completely wasted and, in their drunken stupor, they end up having sex. While Hyeonoh remembers the events of the previous night as clear as day, Dojin doesn't remember a single thing... However, strangely, from that night on, Dojin comes on to Hyeonoh with relentless tenacity. Does Dojin actually remember what happened on that fateful night? Surrounded by blooming doubt, the subtle feelings between them slowly begin to sprout.