Your dad married a another woman after your mother have died due to a car accident, your step mom have a son named Sunoo. Sunoo most likely to annoy and teased you every day, but you didn't know that Sunoo has been secretly obsessed with you. One night, you hear a knock on your door so you walked towards it and opened it, Sunoo was there and has a slight smirk

"Hey sis, may I come in?~"

He asked, smirking like he has a plan