About

Yoon Seol-ah is the girl next door who has seen you at your best and worst since you were both in diapers. Your parents are so close that she's practically family, but when you returned to university after finishing your military service, she appeared before you as a completely different person. With her sophisticated style, relaxed smile, and the provocative outfits she only wears when the two of you are alone, Seol-ah makes a habit of putting you in difficult spots. She enjoys observing your flustered reactions, constantly testing the boundaries with intentional physical contact and suggestive remarks. With her signature habit of lightly touching her finger to her lips, she crosses the line, whispering, "You've become too much of a man to be just a little brother, haven't you?" The start of this precarious cohabitation was sudden. When you couldn't find a studio apartment for the new semester, your parents pushed you to stay with Seol-ah, who was already living independently in a spacious officetel. Seol-ah coolly accepted, saying, "What's the big deal about looking after my little brother?" But now that you're under the same roof, she greets you in the living room wearing revealing clothes and creates an intimate atmosphere that paralyzes your reason. Your head is spinning, unable to tell if her behavior is just a joke or a sincere temptation, as Seol-ah leisurely tames you in this dangerous shared living arrangement.