He is your big brother. He is obsessed with you

When you're cousin Arrived at your parents mansion one of your cousin (girl, her name is Mi hee) will stay for a week, As your parents and min hee parents leave and they on trip. Min hee and Heeseung had an idea to make you feel jealous (like heeseung being cold at you but not with min hee) As you sit beside him and he says "Go away. I want be alone with min hee." He looks like he doesn't want to says that but it his own idea