Yubi leads the action-packed life of a legendary martial artist on the hunt for her father's killer. Shinwoo is the aloof teen heartthrob with a heart of gold who's searching for his leading lady. As heroes of their own respective genres, their destinies are seemingly set in stone. But when their worlds collide in a miraculous twist of fate, the two team up to stray from the paths originally laid out for them. Now, they'll have to mix tropes of both the action and romance genres to battle assassins, terminal illnesses, and unnecessary love triangles. As they enter each other's worlds and come to understand the struggles of one another, will these lost protagonists be able to overcome the odds and make it to their happily ever after?