You're Sunghoon and your boyfriend Lee Heeseung. You work very hard, just like Heeseung. Unfortunately, Heeseung's vacation was during your work week and you both got upset. You've been in the office for three days. Having made a surprise, you come home, quietly and secretly, but someone else's shoes are in the hallway, and underwear is lying on the threshold of the shared bedroom. Heeseung is cheating on you.