Eun-gyeol and his family move into a new neighborhood. He meets a man who offers to teach him how to play the guitar, and Eun-gyeol works hard to learn it. As he deals with bullies at school, he pract…

Eun-gyeol tries his best to quit music, but it's not easy for him to do. He gets scouted to join SPINE9, an indie band in Hongdae. To make things worse, he finally gets his hands on the guitar promise…

Eun-gyeol gets stuck in 1995 and doesn't know how to return to the present. What's worse is that he meets his young father, Yi-chan, who can talk and wants to start a band to impress a girl who isn't …

Eun-gyeol encounters Se-gyeong in her teens and learns a few things about her life that don't make sense in the future. Meanwhile, Yi-chan meets Chung-ah for the first time, but she doesn't say a word…

Eun-gyeol resolves to stop the accident that caused Yi-chan to become deaf and clings to him, vowing to teach him everything he needs to know. He even promises to gift him the band Yi-chan needs. Howe…

Everyone is confused at Se-gyeong's return, especially Eun-gyeol, who sternly warns her to stay away from Yi-chan. However, it doesn't work, and Se-gyeong approaches Yi-chan with different intentions.…

Chung-ah wakes up, realizing she's lying on a hospital bed, with the revelation that Yi-chan carried her there on his back. Later, Yi-chan learns her name from her tag for the first time. Meanwhile, E…

Eun-gyeol wakes up at the house of the Jinsung Family after the accident. He finds out that Chung-ah was the daughter of Chairman Yoon Gun-hyung. Meanwhile, Yi-chan is hospitalized after getting beat …

Astounded by Eun-gyeol's candid love confession for Se-gyeong, Yi-chan retaliates with a spirited punch. Eun-gyeol's attempts at self-defense lead to Yi-chan having a bleeding nose on both sides. The …

Eun-gyeol can't hide his feelings for Se-gyeong and ends up kissing her. Chung-ah's stepmother calls Eun-gyeol separately and tells him to quit before he teaches Chung-ah sign language. The members of…

As the festival draws near, the boys are intensely focused on fine-tuning their band performance. Meanwhile, Eun-gyeol reflects on a pivotal clue related to a potential accident leading to hearing los…

Eun-gyeol successfully cancels the rehearsal and prevents Yi-chan from getting seriously hurt. Chairman Yoon extends the contract with Eun-gyeol and changes the terms and conditions. The day of the fe…

As the enchanting glow of their festival fades, Eun-gyeol and Eun-yu acknowledge the depth of their feelings, hoping for a lasting connection. Meanwhile, the anticipated disbandment takes an unexpecte…

Eun-gyeol and Se-gyeong realize that they’re both time travelers. He learns that Se-gyeong also had a mission to accomplish while she was in 1995. Eun-gyeol finds out that Chung-ah has been confined a…

Eun-yu drops clues about Yi-chan's real hearing loss incident to Eun-gyeol. Knowing that Eun-gyeol tends to shoulder blame for everything, she pledges to support him through this tough time. However, …

Yi-chan gets hit by a car and loses his hearing. Master tells Eun-gyeol to go back to his time, but he refuses, determined to catch the guy who hit Yi-chan. Se-gyeong convinces Eun-gyeol to return to …