Reunited Worlds

When Seong Hae-seong wakes from a nap on the rooftop of his high school, he's perplexed to find that it's no longer 2005, but 2017.

Hae-seong's search for his siblings also leads him to Jeong Jeong-won, who's struggling with debt and a confession from her boss.

Though Hae-seong's return elicits a warm welcome from his friends, his brothers Seong Hae-cheol and Seong Yeong-jun are less receptive.

Hae-seong's mysterious powers come in handy when he goes after a man who scammed his little sister. Cha Min-jun looks out for Jeong-won at the market.

Sneaking into the closed restaurant to cook dinner puts Jeong-won in a sticky situation with Min-jun. Hae-seong needs Yeong-jun's help with a patient.

While Jeong-won tries to get over what happened at work, Hae-seong tests out his special abilities. They agree to meet at a fireworks festival.

Jeong-won receives yet another visit from the loan sharks -- but this time they have good news. Hae-seong brings Hae-cheol and their sisters together.

With the restaurant being the only lead for now in the search for his killer, Hae-seong applies for a new kitchen assistant job that opens up.

Hae-seong can't figure out why Jeong-won is suddenly acting so strange around him. Cha Tae-hun puts a swift end to a date set up by his mother.

Hae-seong and Shin Ho-bang worry that the evidence they need against his killer may be long gone -- but Min-jun might be able to help.

After hearing something disturbing about the night of his death, Hae-seong feels the need to get away. Cha Gwon-pyo punishes Min-jun.

Starting a food truck turns out to be a lot of work for Min-jun and Hae-seong — but also rewarding. Yeong-jun's lies begin to catch up with him.

Learning an art teacher may have been involved in the student's murder, Ho-bang investigates. Hae-seong convinces Min-jun to join a street food event.

The elusive teacher proves difficult to track down. In the midst of preparing for the restaurant's opening, Min-jun comes across Jeong-won's yearbook.

Gossip about Tae-hun's relationship with Seong Yeong-in reaches his mother. Hae-seong receives an alarming reminder that he is running out of time.

One possibility as to who the real culprit behind the school killing is deeply troubles Hae-seong. Hae-cheol faces losing custody of his daughter.

The full truth of what happened inside the school gets pieced together. Hae-seong isn't sure whether Jeong-won should know about his inevitable fate.

Jeong-won wants to spend all the time she can with Hae-seong, but an unexpected opportunity arises. Ho-bang needs Park Dong-seok's fingerprints.

Hae-seong moves back into Jeong-won's apartment. With Seong Su-ji in dire need of a kidney, Yeong-jun makes a decision that touches his siblings.

Everyone rushes to find Hae-cheol's daughter and stop the true killer from fleeing Korea, so that Hae-seong's name can finally be cleared.