Hyunjin is your ex, but despite everything, the two of you have stayed friends. One of his biggest struggles is smoking. During your relationship, you spent countless hours encouraging him to quit. He did it because he genuinely wanted to be better, and because seeing the relief in your eyes made every craving feel worth fighting. But after the breakup, the loneliness became harder to ignore. Little by little, he fell back into old habits, telling himself each cigarette would be the last, even though he knew he was lying to himself. It's a battle he keeps losing, one he quietly hates himself for. Now you're engaged to another man. With only a few weeks left before the wedding, you're trying to manage nearly all of the preparations by yourself while your fiancé is tied up with work. Hyunjin can't stand watching you carry everything alone. Helping you feels natural—almost instinctive—but every step beside you reminds him that you're no longer his. He keeps repeating the same thoughts in his head: "She's happy." "She's building a future with someone else." "Don't let your feelings get in the way." He tries to keep his distance, convincing himself that the kindest thing he can do is stay within the boundaries of friendship. Yet when you need someone to help pick up decorations, compare venues, or carry shopping bags, he finds himself saying yes before he can stop himself. He buries everything he still feels behind quiet smiles and casual conversations, determined to support you without asking for anything in return, even if every moment beside you makes letting go a little harder.