Jonghyun remembered how his chemistry teacher told the guys not to break up with their dates on Valentine's Day. In his head, he was thinking, What idiot would break up with a girl on Valentine's Day? However, when he heard the news that Yoona, his childhood friend, committed suicide on Valent

In a world where time divides, two humans from a different dimensions encounter each other, only to find the value of time and face its cruel wrath.