Composer
Director
Screenwriter
Main Role
- Sung Joon Main Role
- Han Ye Seul Main Role
- Jung Jin Woon Main Role
- Lee Joo Hyung Main Role
Support Role
- Hwang Seung EonGo Yoo RimSupport Role
- Jang Mi HeeBae Mi RanSupport Role
- Byun Hee BongPresident Kim Moon GeonSupport Role
- Choi Seung HoonChoi Soo Hyun [Young]Support Role
- Lee Sun BinLee Ma RiSupport Role
- Kim Sung HoonAssistant LeeSupport Role
Guest Role
- Moon Ji InLee Kyung Joo [Experiment subject](Ep.1 & 5)Guest Role
- Bae Yoo RamLee Jin Soo (Ep. 1)Guest Role
- Choi Tae HwanSung Ho (Ep.5-6)Guest Role
- Go Joo Won[Hye Rim's ex-husband]Guest Role
- Shim Hyung Tak[Male Subject A candidate](Ep.6)Guest Role
- Lee Seung JoonJo Won Gook (Ep.6)Guest Role
- Jo Eun JiYoo Sun / Emma (Ep.7-8)Guest Role
- San ChungTX (Ep.2)Guest Role
- Kim Dong YoonMagician Lee Sang Wook (Ep. 7)Guest Role
- Tae In HoKang Tae Hwa (Ep. 11-12)Guest Role
- Choi Byung Mo[Yoo Rim's husband in Ji Ho's dream](Ep.12)Guest Role
- Kim Jae KyungLee Yoo Ni (Ep. 3-4)Guest Role
- Lee Kan HeeSeo Yeon Hee [Soo Hyun's mom]Guest Role
- Shin Hyun BeenClaire [Soo Hyun's ex-girlfriend]Guest Role
- Oh Jin Seok[Cafe staff]Guest Role
- Choi Gyo Shik Guest Role
- Lee Na Yeon(Ep.8)Guest Role
- Yoo Sang Jae[Love therapist]Guest Role
- Park Jin WooChoi Seung Chan [Child]Guest Role
- Jo Yi Hyun Guest Role
- Lee Jin Kwon Guest Role
- Jang Tae Min Guest Role
- In Sung Ho Guest Role
- Lee Yoon Soo Guest Role
- Ha Soo Ho[Ma Ri's coach]Guest Role
- Jang Ho Jun Guest Role
- Ham Jin Sung[Assistant director]Guest Role
Unknown
- Kim Hyun Unknown
- Moon Ah Ram Unknown
- Lee Geum Ju Unknown
- Lee Hui Sung Unknown
- Lim Jae Min Unknown
- Ji Chan Unknown
- Son Seon Geun Unknown
Bit part
- Park Seung Joon[patient kid in picture]Bit part
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