When Aaliyah meets a handsome stranger at a coffee shop, the two go out for dinner and have a lovely time. Fast forward few months later, Aaliyah is in a happy relationship with Min-Joon. She believes she knows everything about him until an unfortunate event occurs where he is forced to reveal a part of himself he was trying to keep from her. He was an assassin Follow the two as they try to survive a hidden attacker focused on taking away Min's main source of happiness, Aaliyah, while trying to make their relationship work.