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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 loss. Believing Dong-jin to be the helper that Master mentioned, he pleads with Yi-chan to skip the rehearsal, but his request is dismissed. Meanwhile, Eun-yu grapples with the challenge of uncovering her mother's genuine first love.
Ryeoun
Ha Eun-gyeol
Choi Hyun-wook
Ha Yi-chan
Seol In-a
Choi Se-gyeong / On Eun-yu
Shin Eun-soo
Yoon Chung-ah
Choi Won-young
Eun-gyeol's Father
Seo Young-hee
Eun-gyeol's Mother
Jung Sang-hoon
Master
Cheon Ho-jin
Grandpa Viva
Goh Doo-shim
Go Yang-hee
Kim Joo-ryoung
Im Ji-mi
Bong Jae-hyun
Ha Eun-ho
Koo Jun Hoe
Koo Jun-hyeong
Ahn Do-gyu
Oh Ma-joo
Yoon Jae-chan
Kang Hyun-yul
Lee Ha-min
Lee Si-guk
Lee Su-chan
No Se-bum
Kim Tae-woo
Yoon Gun-hyung
Kwon Do-hyung
Yoon Ju-yeop
Lee Soo-min
Yoon Sang-a
Lee Suk-hyeong
Jung Bal-san
Lee So-yeon
Adult Choi Se-gyeong
Park Ho-san
Choi Hyun
Yeon Oh
Jung Ji-oh
Oh Hee-jun
On Ji-hwan
Han Min
Bae Soo-tak
Kim Jun-hyung
Yoon Dong-jin