Sometimes, something very disturbing once can make you misses it.

Sometimes, something that was once not your type can be your type and  you want to have it.

Mark is a Baek Yerin's friends and now, he is an idol. In the busy time, he is feel lonely and misses her.

Baek Yerin is Mark's friend who always sticks to him like a nail and finger.

At that time, Mark was misses yerin and they decided to hang out watching a movie at the theater.