
S01E01 The Return
Hae Sung and Jung Won are ordinary high school seniors who are getting themselves ready for life after graduation. One day, Hae Sung wakes up to find everything surrounding him different. He was dead for...
Jung Won accepts the fact that Hae Sung might have to return one day and decides to make the best out of the days left. Hae Sung finds out that Soo Ji is in need of a transplant, so he gets tested to see if he's a match. Meanwhile, Ho Bang finds out where Park Dong Seok is and chases after him.
Although born in the same year, two childhood friends end up being 13 years apart because they have aged surprisingly at different places (worlds) for some strange reason. Now Eom Hyeon Soo is a 31-year-old woman but Sung Hae Sung is still a 18-year-old boy. Cha Won Yooung is a chef also interested in Eom Hyeon Soo.