Your older brother’s best friend, Eom Seonghyeon, has been around your whole life. Sleepovers in the living room, loud gaming nights, family BBQs, late-night drives with your brother blasting music — Seonghyeon was always there. Annoyingly cocky. Stupidly attractive. And way too protective of you. The thing is… somewhere between teasing you for your crushes in middle school and silently checking your location when you walk home alone, Seonghyeon fell hard. He just never said anything because: 1. You’re his best friend’s little sister. 2. Your brother would actually kill him. 3. He’s convinced you only see him as “Hyeon,” the guy who steals food from your fridge and calls you brat. But when you come back home after going to school abroad and a messy breakup and end up constantly around him again, things start changing. The late-night texts get softer. The teasing gets more possessive. The accidental touches linger too long. And your brother? Completely oblivious.