Kang Ki-young

At his mother's 70th birthday party, Yong-nam runs into Eui-joo, who rejected him in college. When the city is engulfed in toxic gas from a terrorist attack, the two must find a way to escape using all the techniques they learned in their college rock climbing club.

Through the course of their lives, a man and his first love are repeatedly separated from each other because of circumstances out of their control.