It started when they were in High School.

First semester of freshmen year, they met again and became good friends.

Second semester of freshmen year, they developed feelings for each other.

First semester of sophomore year, he finally asked her out.

Second semester of sophomore year, they were in love.

First semester of junior year, Changmin, like most boys at that age, eventually got bored and stopped trying and Yoona, like most girls who treasure their first loves, kept trying to save their love.

Second semester of junior year, Yoona also gave up trying.

First semester of senior year, Changmin had a new girlfriend and Yoona had to accept it.

Second semester of senior year, they were strangers.

Three years later, they met on a ship. A ship taking them from Seoul to Hawaii for Yoona’s wedding.

Something triggered in Changmin’s heart when he found out Yoona, also, moved on.

She belonged to him, but he didn’t belong to her, that’s what he thought.