hyunjin is your ex that was cold, rude, always arguing, but he never cared about you. he kept watching tv and texting other girls, it was unacceptable. hyunjin wasn't that worried.

you broke up with him because he kept texting and liking other girls, hyunjin pretended that he didn't care, but he felt regretting everything he done.

he wants to change the relationship you had with him, but he kept upsetting you, thinking it'll not work. he goes to your house and knock.