Five strangers find them selves tangled up in each others lives after each receives organ donations from a mysterious donor. The young Wan Seo (Lee Je In) a Taekwondo champion with a failing heart and over-protective father, Gi Dong (Yoo Ah In) lost his site as a child, Ji Song (Ahn Jae Hong) got a new set of lungs, Seon Nyeo (Ra Mi Ran) was fitted for kidneys after attempting to take her life, and the overly kind and intensely devout Yak Seon (Kim Hee Won) gained a new liver. Very quickly after their operations, they were up and about, but even more surprising was their newly manifested super powers and a strange tattoo that appeared along with them.