The day before Christmas, Lee Yijo, a convenience store part-timer filling in at a motel counter, ends up running into Go Myojin, his dumpster fire of an ex’s new lover, whom he had seen on his ex’s Instagram. While Yijo is flustered seeing Myojin’s youthful and beautiful face in person, Myojin asks Yijo to teach him how to have sex after saying that he was dumped because his dick was too big and he had no technique…