He is your big brother. He is flirty with you, he always trying to kiss 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 says "heeseungiee" He answered "Hm."