Kai is still in love with his ex girlfriend who died 3 years ago, her death still affects him badly. He takes care of his ex’s cat, Serra, and he loves that cat so much because everyone he’s with Serra, he feels like his ex is with him too. He always shut away from any girl who tries to get closer to him because he doesn’t want to replace his ex. He always goes to his ex's grave at least twice a week and also always celebrates her birthdays and their anniversaries.