A free-spirited famous idol, a struggling singer, and their crew of "twenty-something-year-olds." When they meet, it will be an orchestra of disaster.
In 1993, a powerful typhoon sweeps idol star Yoo Hyun-jae into the future. Meanwhile, best friends Woo-seung and Ji-hoon end up at the police station.
Hyun-jae wakes up in a hospital, overwhelmed by the unfamiliar world of 2017. He escapes the hospital and spots a car he recognizes - his own.
Pretending to have amnesia from the car accident, Hyun-jae ends up living with Ji-hoon and Woo-seung. However, Bo-hee nearly discovers him.
Woo-seung blames her failed exam on the 20-year-old chocolate Hyun-jae gave her. Meanwhile, Ji-hoon is sad about a professional setback.
A drunken Bo-hee mistakenly thinks she saw Hyun-jae in a dream. He mentions this to Gwang-jae, who worries that Hyun-jae will return to the past.
Hyun-jae is shocked to learn that Ji-hoon is his son. Gwang-jae, troubled by Hyun-jae's presence in Bo-hee's life, gives Hyun-jae a cell phone.
After finding Ji-hoon's trainee ID, an angry Gwang-jae goes up to the rooftop and discovers that Hyun-jae, Woo-seung, and Drill are living together.
Woo-seung misunderstands Ji-hoon's relationship with Hye-ri. Meanwhile, Hyun-jae and Gwang-jae try to track down the money Hyun-jae hid in 1993.
Calling himself a “love guru,” Hyun-jae gives Ji-hoon dating advice. Meanwhile, Ji-hoon helps at a bakery, where a photo of him goes viral online.
Hyun-jae is startled to find himself looking at Woo-seung with affection. Later, he hears the villa building may be lost due to unpaid bank debt.
Ji-hoon auditions for Korea's largest entertainment agency. Hyun-jae, jealous after seeing Woo-seung with MJ, takes advantage of his company status.
Ji-hoon notices that Hyun-jae's watch is identical to his own. Meanwhile, Hyun-jae confesses to Ji-hoon that he may have feelings for Woo-seung.
Ji-hoon learns that "Dabong" was actually Yoo Hyun-jae. Meanwhile, Young-jae steals both a major investor from Gwang-jae and a song from Hyun-jae.
Woo-seung learns that Dabong is the same Yoo Hyun-jae who disappeared 20 years ago. During a camping trip, Hyun-jae apologizes to Ji-hoon.
Young-jae tells Hyun-jae about something that happened the day he disappeared in 1994. Just then, a news report says a typhoon is approaching.
Ji-hoon and Drill finally debut as a duo and nervously prepare for their first live performance. Also, Gwang-jae tries to propose to Bo-hee.
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