In this world, the oldest you look is 23, that is until you've met your soulmate, with whom you may grow old, and love for the rest of your life.
Jeongguk is 287, and he still hasn't found his soulmate. He is known as a roamer, a being without soulmates.
They're known to be a threat and considered dangerous.
One day through a dating app, that Namjoon installs for him, he comes across a girl named Kim Chaeyeon.
Will he shut her out like he's done with numerous people, or will he let her in, and move on from his haunted past?