Assistant Editor
Cinematography
Composer
Costume Designer
Editor
Producer
Production Sound Mixer
Screenwriter
Screenwriter & Director
Main Role
- Shim Eun KyungIm Na Mi [Teen]Main Role
- Kang So RaHa Chun Hwa [Teen]Main Role
- Kim Min YoungKim Jang Mi [Teen]Main Role
- Park Jin JooHwang Jin Hee [Teen]Main Role
- Min Hyo RinYoung Su Ji [Teen]Main Role
- Nam Bo RaSeo Geum Ok [Teen]Main Role
- Kim Bo MiRyu Bok Hee [Teen]Main Role
- Yoo Ho Jung Main Role
- Jin Hee Kyung Main Role
- Go Soo HeeKim Jang MiMain Role
- Hong Jin HeeHwang Jin HeeMain Role
Support Role
- Lee Yeon KyungSeo Geum OkSupport Role
- Kim Sun KyungRyu Bok HeeSupport Role
- Kim Shi HooHan Joon Ho [Teen]Support Role
- Kim Young Ok[Na Mi's grandmother]Support Role
- Kim Hye Ok[Na Mi's mother]Support Role
- Jung Won Joong[Na Mi's father]Support Role
- So Hee Jung[Homeroom teacher]Support Role
- Kim Won Hae[Teacher]Support Role
- Chun Woo HeeSang MiSupport Role
- Kim Ye Won[Leader of band 'Girl's Generation']Support Role
- Baek Jong Hak[Na Mi's husband]Support Role
- Ha Seung RiYe Bin [Na Mi's daughter]Support Role
- Lee Kyung YoungHan Joon HoSupport Role
- Lee Joon Hyuk[President of Private detective office]Support Role
- Yoon JungSu JiSupport Role
- Han Seung Hyun[Jung Mi's older brother]Support Role
- Park Young SeoJong Ki [Na Mi's older brother - Teen]Support Role
- Yang Hee Kyung[Jang Mi's mother]Support Role
- Joo Jin MoSung ChanSupport Role
- Park Hee JungYoung JinSupport Role
- Go Jun[Detective]Support Role
Guest Role
- Jung Suk YongJong Ki [Na Mi's current older brother]Guest Role
- Kwon Eun Soo[School broadcasting club DJ] (past)Guest Role
- Choi Yi Sun[Joon Ho's friend]Guest Role
- Geum Bo Ra[Special appearance in past picture]Guest Role
- Jung Won Gwan[Special appearance in past picture]Guest Role
- Kim Bo Yeon[Special appearance in past picture]Guest Role
- Kang Soo Yeon[Special appearance in past picture]Guest Role
- Go Doo Shim[Special appearance in past picture]Guest Role
- Jo Min Soo[Special appearance in past picture]Guest Role
- Hwang Shin Hye[Special appearance in past picture]Guest Role
- Park Soon Chun[Special appearance in past picture]Guest Role
- Shim Hyung Rae[Special appearance in past picture]Guest Role
- Park Joong Hoon[Special appearance in past picture]Guest Role
- Ahn Sung Ki[Special appearance in past picture]Guest Role
- Chae Shi Ra[Special appearance in past picture]Guest Role
- Lee Mi Sook[Special appearance in past picture]Guest Role
- Lee Bo Hee[Special appearance in past picture]Guest Role
- Lee Deok Hwa[Special appearance in past picture]Guest Role
- Lee Sang Ah[Special appearance in past picture]Guest Role
- Kim Sae Byeok[President of class 3 grade 2 in the past]Guest Role
- Han Bo Reum[Outcast of class 3 grade 2 in the past]Guest Role
- Lee Seung Heon[Joon Ho's friend]Guest Role
Bit part
- Jun Yoon Ji[Student presenter at festival]Bit part
- Sung Ji Ru[Chun Hwa's attorney]Bit part
- Lee Jong Hwan[Radio DJ from the past]Bit part
- Choi Soo ImIl Jin [School girl]Bit part
- Joo Myung Chul[Detective from the past]Bit part
- Bae Soo Kyung[Gang high school girl]Bit part
- Park Min I[Young Star Employee]Bit part
- Ryu Hye Rin[Member of band 'Girl's Generation']Bit part
- Kang Rae Yeon[Jong Gi's girlfriend, teen]Bit part
- Uhm Hye Soo[Sang Mi's group]Bit part
- Jung Ye Jin[Student of class 3 grade 2 in the past]Bit part
- Kim Min Seo[Geum Ok's niece]Bit part
- Ahn Soo Ho[Judge]Bit part
- Kim Min Jae[Young star in a music video]Bit part
Unknown
- Choi Na Moo Unknown
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