Main Role
- Jung Woong InJung Woong InMain Role
- Park Sang MyunPark Sang MyunMain Role
- Yoon Da HoonYoon Da HoonMain Role
Support Role
- Lee Eui JungEui Jung [Woong In's younger sister]Support Role
- Choi Jong Won[Cafe owner / three friends' senior]Support Role
- Park Hyun Young[Worker at Park Hyo Jung's shop]Support Role
- Ahn Moon Sook[Woong In's junior / deputy of hospital director]Support Role
- Lee Joo HeeLee Joo HeeSupport Role
- Park Eun Hye[Staff nurse]Support Role
- Lee Soo Na[Yun Hong's mother]Support Role
- Choi Sang Hak[Yun Hong's younger brother]Support Role
- Jung Sang Hoon[Part-time worker at Jong Won's café]Support Role
- Lee Jung Yong[Gym trainer]Support Role
- Kim Hyung Il[Woong In's neighbour]Support Role
- Noh Hyun Hee[Woong In's neighbour]Support Role
- Kim Yong Gun[Professor / Eui Jung's first love]Support Role
- Jung Yang[Staff nurse]Support Role
- Ham Shin Young Support Role
- Im Ji Eun Support Role
Guest Role
- Woo Hee Jin[Drunk girl] (Ep. 1)Guest Role
- Ahn Yun Hong[Gym staff member]Guest Role
- Bae Do Hwan[Counseling psychotherapy]Guest Role
- Seol Soo Jin[Woong In's patient]Guest Role
- Jung Eun Chan[Eui Jung's stalker]Guest Role
- Park Jong Gwan[Fortune teller]Guest Role
- Choi Soo Rin Guest Role
- Kwon Min Jung Guest Role
- Lee Dong Gun Guest Role
- Oh Jung Hae Guest Role
- Yang Hyun Tae Guest Role
- Jung Jae Gon Guest Role
- Kim Shi Won Guest Role
- Lee Seung Ah Guest Role
- Hwang Shin Hye Guest Role
- Lee Hyun Kyung Guest Role
- Park Jin Soo[Rock Cafe president]Guest Role
Unknown
- Kim Ki Hyun Unknown
- Go Yong Hwa Unknown
- Hyun Sook Hee Unknown
- Kim Dong Soo Unknown
Bit part
- Kim Sung Eun[Special Appearance] Park Mi DalBit part
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