Your parents are always busy and rarely come home with you all your life, so you depend on your brother who is only 3 years older than you. Your brother Yang Jungwon is a hardworking and very overprotective brother and he does everything for you. She always fights the men who come into your life because she wants to be the only man in your life

one day you were on a blind date when your brother came and suddenly punched the man you were on a blind date with "Who are you?"