- Kim Rae-won
- Lee Jae-hoon
- Kong Hyo-jin
- Oh Sun-young
- Kang Ki-young
- Choi Byung-chul
- Sung Byoung-sook
- Oh Sun-young's mother
- Lee Chae-eun
- Gyeong-eun
- Oh Dong-min
- Hyeon-seong
- Kang Eun-su
- Kim Jeong-soo's wife
- Lee Geon-hui
- Young man 2 from bar
- Song Gyu-yong
- Lee Jae-hoon's father
- Jeong Hye-rin
- Bae Yun-ju
- Jeong Hyeon-gyu
- Kimchi stew restaurant employee
- Bae Hyun-Sung
- New recruit
- Ji Il-joo
- Dong-hwa
- Yun Jae-il
- Dong-hwa's girlfriend
- Jo Jae-wan
- Photographer
- Choe Jeong-won
- Hyeon-seong's mother
- Min Ji-an
- Kim Jeong-soo's child 2
- Im Ji-hyeong
- Young man 1 from bar
- Jo Ji-hyun
- Moving center employee
- Choe Ji-won
- Female model from cell phone ad
- Cha Jung-won
- Cha Jung-won
- Park Keun-rok
- Gang Seon-yun
- Yoon Kyung-ho
- Jeong-soo
- Ma-bin
- Male model from cell phone ad
- Jeong Mi-ran
- Lee Jae-hoon's mother
- Shin Min-jae
- Sin Min-jae
- Joo Min-Kyung
- Ju-hui
- Hong Min-seong
- Kim Jeong-soo's child 1
- Kim Jin Ok
- Employee from potato soup restaurant
- In-Yeong Park
- Han-byeol
- Song Pil-geun
- Voice from fishing channel
- Son San
- Angry woman at Izakaya restaurant
- Lee Seung-chan
- Izakaya restaurant manager
- So-yeon Shim
- Woman from elevator
- Jang So-yeon
- Jang Mi-yeong
- Kang So-yeon
- Actress playing mother in 'Okay Boy' ad
- Ryu Ha Sung
- Child actor from 'Okay Boy' ad
- Son Sung-chan
- Guard from Oh Sun-young's officetel
- Son Woo-Hyun
- Do-yun
- Jeong Woong-in
- Seo Gwan-su
- Song Ye-jin
- Pet shop employee
- Han Ye-seong
- Hyeon-jin
- Son Yeo-eun
- Cheon Su-jeong
- Kim Yeon-Chul
- Lighting technician
- Jo Yeong-bok
- Hyeon-seong's father
- Son Yeong-soon
- Grandmother selling corn
- Kim Young
- Assisting staff
- Im Yu-Ran
- Landlord
- Cha Yup
- Owner of mother's car
