Director
Screenwriter
Main Role
- Ahn Hee Yeon"Jenna" / Kim Je NaMain Role
- Ahn Sol Bin"Hyun Ji" / Oh Hyun JiMain Role
- Han So Eun"Stella" / Jang StellaMain Role
- EXY"L" / Kang Yu RiMain Role
- I.L"Chae A" / Park Chae AhMain Role
- Kwak Shi YangCha Jae HyukMain Role
- Kim Min KyuSeo Ji HanMain Role
Support Role
- Cho Jun Young"Ray" / Han Sun Woo [Mars member]Support Role
- Baek Seo Hoo"Tae Young" / / Park Tae Young [Mars member]Support Role
- Hong Eun Ki"Yul" / Kim Yul [Mars member]Support Role
- Lee Eun Sang"Dan" / Park Eun Dan [Mars member]Support Role
- Cha Sun WooTroySupport Role
- Ahn Se HaYoon Se YulSupport Role
- Kim Kyung IlPark [Assistant manager]Support Role
- Lee Soo In[StarPeace Entertainment Staff]Support Role
- Lee Yoo JinBbiyong [Producer]Support Role
- Jung Woong InMa Jin Woo [CEO]Support Role
- Kang Jae JoonJin Doo Ho [Manager]Support Role
- Park Si HyunAe Rin [Hyun Ji's Friend]Support Role
- Park Joon SooGo Seok ChunSupport Role
- Kim Ye JiRomy [Highteen]Support Role
- Oh Su YunLee Ju Yeon [Assistant manager]Support Role
Guest Role
- Jang Sung KyuJang Sung Kyu [Radio host] (Ep. 1)Guest Role
- BIG Naughty[Himself] (Ep. 1)Guest Role
- Narsha[Herself] (Ep. 1)Guest Role
- Jang Young Hyun[Producer] (Ep. 1)Guest Role
- Choi Yo Woon[Audience member] (Ep. 1)Guest Role
- Lim Seo WonHyun Ji [Young] (Ep. 2)Guest Role
- Kim Jin GeunPark Seong Jin [CEO] (Ep. 2, 6-7, 9)Guest Role
- Son Suk Bae[Hyun Ji's father] (Ep. 2)Guest Role
- Kim Byung Chun[Management director] (Ep. 2)Guest Role
- Lee Yo Sung[Fast food restaurant manager] (Ep. 2, 11)Guest Role
- Kim Ji InSo Yeon [KillA] (Ep. 3, 7-8, 12)Guest Role
- Song Hoon[Chief] (Ep. 3)Guest Role
- Jung Yoon Hee[Film production member] (Ep. 3)Guest Role
- Jeong Yoon Hee[Film production member] (Ep. 3)Guest Role
- Kim Ki Yeon[L's mother] (Ep. 4)Guest Role
- Park Sang Hwi[Culture Foundation staff] (Ep. 5)Guest Role
- Yoon Sung Hyuk[Bbiyong's friend] (Ep. 5)Guest Role
- Kwon Dong Won[Dormitory staff] (Ep. 5, 7)Guest Role
- Shin Jae HoonMo Ga Jin [Reporter] (Ep. 5, 8-9, 11-12)Guest Role
- Kim So Eun[Troy's employee] (Ep. 6)Guest Role
- Yoon Bok InDr. Cha (Ep. 7-8)Guest Role
- Park Joon Sang[Management company CEO] (Ep. 8)Guest Role
- Kang Cho Won[Mars fan] (Ep. 9-10)Guest Role
- Lia KimLia Kim (Ep. 10)Guest Role
- Son Byung HoKim Ho Young (Ep. 10-11)Guest Role
- Kim Min JoonSeo Ji Han [Young] (Ep. 10)Guest Role
- Lee Ga YeonKim Jung Yeon [Kim Ho Young's Daughter] (Ep. 11)Guest Role
- Oh Jung Yeon[Interviewer] (Ep. 11)Guest Role
- Oh Yoon Hong[Stella's mother] (Ep. 11)Guest Role
- Lee Joong YulGyeong Tak (Ep. 12)Guest Role
- Eunseo[Herself; Music Tank MC] (Ep. 12)Guest Role
- Kang Min Hee[Himself; Music Tank MC] (Ep. 12)Guest Role
- Kyung Ki Hyun[Vlogger] (Ep. 12)Guest Role
- Son Sook[Hyun Ji's grandmother] (Ep. 12)Guest Role
- Lee Chang Won Guest Role
- Park Jun HyukCha Jae Hyuk [Teen] (Ep. 10)Guest Role
- Raiden[Himself] (Ep. 1)Guest Role
- Kim Joon Ho Guest Role
- Jang Eun SeoSeong Ji Hye [Writer] (Ep. 1, 10)Guest Role
- Kim Jin Kyu[Reporter] (Ep. 9-10)Guest Role
- Kim Jeong Nam[Audience member] (Ep. 1)Guest Role
- Kim Han SolSeo Ji Han [Child] (Ep. 10)Guest Role
Unknown
- Kwon Tae Hee Unknown
- Jung Tae Ryung Unknown
- Bang Jin Won Unknown
- Choi Hyoung Uk Unknown
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