Director
Main Role
- Song Ha YoonSeo Ji SungMain Role
- Lee Jun YoungJung Kook HeeMain Role
- Yoon Bo MiMoon Ye SeulMain Role
- Gong Min JungTak Gi HyunMain Role
Support Role
- Joo Woo JaeHan Yoo Jin [President of Han & Bang Dental Clinic]Support Role
- Nam Min WooOk Dong Jin [Pelican R&D team member/vlogger]Support Role
- Kim Ki RiJegal Soo Won [Pelican R&D Manager]Support Role
- Lee Si HoonBang Jung Han [Ji Sung's fiance]Support Role
- Kim Kyung IlGam Oh Jung [Jung Kook Hee's EMS partner]Support Role
- Kim Tae GyumKim Sang Shik [Tak Gi Hyun's husband]Support Role
- Hwang Young HeeLee Eun Hwa [Seo Ji Sung's mother]Support Role
- Park Han SolByun Ha Ri [Pelican R&D team member]Support Role
- Kang Mal GeumHwang Ga Eul [Pelican Senior Manager]Support Role
- Jung Min SungOh Byung Gil [Pelican R&D Director]Support Role
- Choi Baek GuKim Jin SooSupport Role
- Shin Ji Yeon[Nurse]Support Role
- Kim Hyun MyungJo Yong HwanSupport Role
- Kim Moon ChanKim Moon ChanSupport Role
Guest Role
- Jung In Ki[Seo Ji Sung's father]Guest Role
- Lee Ji Ha[Jung Han's Mother] (Ep. 2)Guest Role
- Jung Hyung Don[Candid Interviewer] (Ep. 2)Guest Role
- Yoo Jae Pil[Candid Interviewer] (Ep. 2)Guest Role
- Ahn Il Kwon[Man threatening to jump out the window] (Ep. 3)Guest Role
- Hong Yoon Hwa[Photographer] (Ep. 6, 9)Guest Role
- Lee Jung HyungKang Hyun Soo (Ep. 7)Guest Role
- Joey AlbrightJames [Hostel Guest] (Ep. 9)Guest Role
- Lee Jin SooYeon Ha Jun (Ep. 4-5)Guest Role
- Yoon Don SunHwang Ki Cheon (Ep. 9)Guest Role
- Kim Jae In[Sang Hoon's girlfriend] (Ep. 1)Guest Role
- Park Sun Ah[Jung Jae Min's mother] (Ep. 9)Guest Role
- Jang Joon Hyun[Detective] (Ep. 2, 10)Guest Role
- Lee Mu Song[Yu Jin's father]Guest Role
- Noh Sa Yeon[Yu Jin's mother]Guest Role
- Ho Yoon[Jung Han's friend] (Ep. 1, 4)Guest Role
- Shin Ji Yeon[Nurse]Guest Role
- Byun Hong Jun[Bully student] (Ep. 5, 9)Guest Role
- Kim Tae BumWoo Ki Ja [Reporter] (Ep. 6)Guest Role
- Richard Kim[ Station Team Leader] (Ep. 5)Guest Role
- Hong Dal PyoKang Sang Jun (Ep. 6, 9)Guest Role
- Jang Hae Min[Employee]Guest Role
- Shin Soo OhJung Sang Hoon (Ep. 1)Guest Role
- Kang Sung ChanJung Jae Min [Teen] (Ep. 5, 9)Guest Role
Unknown
- Son Joo Yeon Unknown
- Park Tae Woo Unknown
- Yoo Jin Seok Unknown
Bit part
- Cho Hyun Min Bit part
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