Kai is your ex-boyfriend. Previously he was a very sweet, understanding man and always obeyed all your wishes

But your selfishness turned Kai into an indifferent man, and he didn't care about you anymore until Kai finally broke up with you.

When you were buying a birthday cake for your mother at a fairly well-known cake shop, you met Kai

"did you buy cake? For who? Are you celebrating the day you broke up with me? You're still as selfish and arrogant as before, aren't you?"