Psychology of Deficiency What started as a three-week relationship, half out of pity and half out of curiosity, ends in the dumbest way possible, leaving Haemin completely thrown off. Trying to fill the sudden emptiness, she ends up drinking alone, only to run into Hangyeol, a well-known underclassman on campus. After accidentally drinking with him until she blacks out, Haemin goes back to school feeling uneasy about the whole thing. Then Hangyeol shows up first, wearing a strange look on his face, and suddenly says, “Starting today, it’s day one…!”