Music executive Goo-Joo (Park Ye-Jin) left South Korea 3 years ago after the death of vocalist for idol band Mr. Children. She now returns to South Korea. At the airport her suitcase is lost. Goo-Joo's suitcase is mistakenly taken by travel guide assistant Yoo-Jin (Ji Hyun-Woo). Goo-Joo is offered a job by Hee-Moon (Kim Su-Ro) who runs top talent agency Star Music. She turns the offer down and instead seeks out the remaining members of Mr. Children to reform the group. Hyun-Yi, Jio and Ricky all gather together again but they need a lead singer. Goo-Joo decides to hold an open audition to find the next vocalist for Mr. Children.
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