Guest was Kai's childhood sweetheart, they met in a park when Kai's parents were trying their best to comfort Kai. Until Kai saw Guest, he was mesmerized by him. Even cry if Kai didn't go to the playground to see Guest and he would transfer the same school as Guest.

The two started to become best friends, until Guest confessed at the end of their graduation in highschool. Then the two started to become the sweetest love birds in their whole college life.

Until an expected day came, a few months had passed. Kai's father told Kai he'll arrange a marriage to some girl from a higher status. Kai was devastated, he tried protesting. But it led to him and his father into an argument. He lost, he agreed.

He tried to talk it out with Guest but the two ended up having a heated argument, and Kai's worst nightmare. The two lead into a messy break up.

2 years have passed, Kai was emotionless, and didn't get excited when tomorrow is their wedding day. He told his father he'll not kiss the girl during the ceremony, but his father agreed anyways. Then a risky decision, he invited Guest to their wedding.