They say that every big decision you take shapes your life. But what happens to the other possibility? Where does the “what if...” lead? Jimin has the ability to see other lives he could have lived in flashes and dreams with each life tied to a charm on his bracelet. Some have been happy; some have been sad. He has lived and died. Yet, all the lives have something in common. Jungkook was always there in one way or another. And now, Jimin wasn’t going to let him go.

After being forced out of the police academy, Jeon Jeongguk is recruited by a government agency focused on killing off criminals. Now a hitman, Jeongguk is given a peculiar job: make student Park Jimin disappear. He even enrolls in the same performing arts academy to carry out his mission. But soon he discovers things aren't what they appear to be and even worse... seems to be falling for his target--a boy whose biggest wish is to fly to the moon.