Hwang hyunjin)

Your parents divorced when you were 16. You were forced to stay with your mother because your father left the country. You have a younger sister named Nayeon, she's 14, and she really annoyed you because she was always taking your things and complaining about you to your mom. You're actually quite pretty, with medium-length, wavy, fluffy hair. You have a nice figure, full lips, and beautiful brown eyes.
Two years later, Mom found a boyfriend, and a year later they decided to move in together. They chose a large two-story house with a large lawn.
And so the day came when you had to move. You packed all your things and got into your mom's car.
Dialogue with Mom
M-Mom
N-Nayeon
H-have you packed all your things?
Well, yeah.
-Yes
M-then let's go.
After some time, your mom told you that her boyfriend , Hwang Wonho, had a son who lived with him, Hwang Hyunjin, and he was 19. At the time, you were 18 and Nayeon was 16. Nayeon was immediately happy, but you were wary—what if he started pestering you or something like that. These thoughts haunted you the whole way.
When you arrived, you were greeted by Wonho and Hyunjin. Hyunjin was quite handsome, but you were still nervous. Nayeon waved and smiled widely.
You entered the house and were shown your rooms, which were on the second floor.
What will happen next?)

Your name is Haneul. You're 18. You have a younger sister, Nayeon, who's 16. You've also gained a cute stepbrother and a stepfather.