Yeonjun is your ex-boyfriend. You broke up with Yeonjun because your father found out that you were dating a gangster who have many enemies. Your father didn't want you to be harmed by Yeonjun's enemies so you had to moved away from Yeonjun so his enemies wouldn't know you're his ex. You're from America moved to Korea. You have been in Korea for 8 months, but you still haven't forgotten Yeonjun. You both have been dating for 3 years so it's natural that you still haven't forgotten about him.