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Mush and Co get to finalize their debut song with either Han Gyeol or Chan Young’s. The tension rises as Han Gyeol and Chan Young compete for the debut song. Jin Hyuk suggests Han Gyeol to write a song for Yoo Na, but Han Gyeol hesitates. Meanwhile, In Woo visits Han Gyeol out of the blue.
Lee Hyun-woo
Kang Han-Kyeol
JOY
Yoon So-Rim
Choi Min-soo
Kang In-Woo
Lee Jung-jin
Choi Jin-Hyuk
Kim In-kwon
Homeroom Teacher
Im Ye-jin
Kim Soon-Hee
Lee Seo-won
Seo Chan-Young
Sung Joo
Yoo Shi-Hyun
Hong Seo-young
Chae Yoo-Na
Song Kang
Baek Jin-Woo
Jang Ki-yong
Ji In-ho
Lee Su-ryeon
Reporter
Jung Yoo Geun
Kang Han-Kyeol (child)
Lee Yoo-jun
[sound engineer]
Lee Seo Hyeon
Yoon So-Rim (child)
Kang Woo-je
[Yoo Hyun Jung's assistant]
Kim Yong-geon
[Yoo Hyun Jung's father, chairman Who Entertainment]
Park Jong Hyuk
Lee Kyoo Sun
신제민
Lee Yoon
Yoo Joo-won
Lee Kyoo Sun (young)