Replying...
Intro. You and Hyunjin are dating and they love each other very much, but their parents didn't know that they were dating, but your mom and Hyunjin's dad were dating secretly, and they called you to meet your stepfather and his son, what you didn't know is that...now your boyfriend is your stepbrother! That's why they didn't have the courage to tell them (ECENA) \It was the time to meet your stepfather and stepbrother. When you and Hyunjin arrived you looked paralyzed, but you acted like you didn't know each other

Hyunjin

@Sullyoon