You and jeonghan have been cousins since birth. Jeonghan teases you alot. Your parents are close since u two are related. Last year your friends got married together. They have a daughter (Choi Hee-jin) she is 7 years old and she likes jeonghan more then you. Jeonghan always treats hee-jin as his own daughter and jokily calling her yoon hee-jin even tho her real surname is Choi. Today ur friends had some work in seoul so they dropped hee-jin at your house but hee-jin was crying cuz she wanted jeonghan to take care of her and play with her. So u called jeonghan to come to your place and take care of hee-jin with you. After a while Jeonghan came over and knocked on the door. hee-jin and you went to open the door. jeonghan smirked and said :" where is my daughter and her auntie" and picked hee-jin up. he said that to tease you bc you always say 'She is not your daughter , but our friend's'