Eun Gyeol and his family move into a new neighbourhood where he starts to learn the guitar. As he deals with bullies at school, he practices playing the guitar until he is as good as the man who taught him.
Eun Gyeol, who sternly warns Se Gyeong to stay away from Yi Chan. At the same time, Chung Ah can only stand by and watch as she realizes she's lost her chance to tell Yi Chan how she feels.
Chung Ah wakes up and realizes that 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.
Yi Chan is hospitalized after getting beat up by the local thugs. After the accident Eun Gyeol wakes up at the house of the Jinsung Family and finds out that Chung Ah was the daughter of Chairman Yoon Gun Hyung.
Eun Gyeol's attempts at self-defence resulted in Yi Chan with a bleeding nose on both sides. This made schoolyard into a battleground with more students intervening.
As a festival nears, boys focus intensely on tuning their band's act. Meanwhile, Eun Gyeol reflects on a clue about a possible mishap causing hearing loss.
Eun Gyeol cancels the rehearsal, preventing Yi Chan's injury. Chairman Yoon extends Eun Gyeol's contract with revised terms. Se Gyeong must choose between Eun Gyeol and Yi Chan at the festival. Chung Ah doesn't attend the festival.
After their festival, Eun Gyeol and Eun Yu realize their feelings. The group gets another chance instead of disbanding. They need to write a song, and Yi Chan plans a meetup, wondering how to include Chung Ah.
Eun Gyeol and Se Gyeong are time travelers from 2022. They each had a mission in 1995. Eun Gyeol discovers Chung Ah was confined and abused for 12 years. Se Gyeong reveals Yi Chan's accident hasn't happened yet.
Eun Yu drops clues about Yi Chan's real hearing loss incident to Eun Gyeol. Together, they methodically investigate everyone linked to the accident in search of the truth.
