 |
 |
 |
 |
 |
| Kwak Do-Won | Yoon Doo-Joon | Han Go-Eun | Park Won-Suk | Jung Dong-Won |
| Gu Pil-Su | Jung Suk | Nam Sung-Mi | Cheon Man-Geum | Gu Jun-Pyo |
 |
| Kim Young-Woong |
| No Il-Nam |
 |
 |
| Kwon Hae-Hyo | Kim Ji-Hoon |
| Jung Seok's father | Jung Seok (young) |
 |
 |
| Park Sung-Yeon | Kim Dong-Joon |
| Sharon Oh | Nam Sung-Tae |
 |
 |
 |
 |
| An Seong-Won | Go Seung-Bo | Kim Min-Seo | Kim Ji-Young |
| Choi Young-Jae | Lee Dong-Kyu | Kim Ji-Hyun | Joanna |
 |
 |
| Jung Da-Eun | Kim Hyun-Myung |
| Oh Seul-Ki | Choi Hyun-Soo |
 |
 |
 |
 |
| Jeong Jae-Kwang | Shin Joo-Hyup | Seo Ji-Won | Yu Yeon-Su |
| Lee Min-Jae | Kim Yong-Hyun | Song Young-Il | Ji-Hye |
 |
 |
 |
 |
| Kim Tae-Hoon | Wang Ji-Won | Hak Jin | Choi Nam-Wook |
| Hwang Eun-Ho | Cha Yoo-Jin | Alex | awards committee (ep.14) |
 |
 |
 |
 |
 |
| Lee Mi-Yoon | Park Ye-Rin | Yeo Woo-Rin | Kim Chae-Hyun | Jung Hae-Na |
| Bok-Soon | Eun-Sil | Dong-Kyu’s mother | Ji-Hyun’s mother | Lee Chae-Eun |
 |
 |
 |
 |
 |
| Park Kwang-Jae | Heo Woong | J Black | Song Young-Jae | Kim Nam-Jin |
| Kwang-Jae | Ho-Cheol | Montana | Cheon Man-Geum's doctor | Cheon Man-Geum's caregiver |
 |
| Jun Ho-Young |
| Bol-Ri |
 |
 |
 |
 |
 |
| Kim Eun-Soo | Cha Soon-Bae | Lee Dong-Yong | Kim Yun-Tae | Kim Mi-Ra |
| chicken restaurant client (ep.1) | Mr. Cho (ep.1,14-15) | neighborhood football team (ep.1) | neighborhood football team (ep.1) | Big Bird Investment CEO (ep.2) |
 |
 |
 |
 |
 |
| Hwang Yun-Seon | Lee Hwi-Seo | Cha Ye-Jun | Song Ji-Ho | Song Hoon |
| Big Bird Investment CEO's secretary (ep.2) | Jung Seok's acquaintance (ep.3) | Jung Seok's acquaintance (ep.3) | Kim Gun-Woo (ep.3-4) | Kim Gun-Woo's father (ep.4) |
 |
 |
 |
 |
 |
| Kim Se-Dong | Gu Bon-Jin | Jeon Jin-Oh | Kim Ha-Eon | Jung Yun-Ha |
| Kim Gun-Woo's acquaintance (ep.4) | Kim Hyun-Cheol (ep.6) | Lee Hak-Jin (ep.7-8) | Lee Se-Joon (ep.7-8) | Song Yoo-Jung (ep.7-8) |
 |
 |
 |
 |
 |
| Seo Kwang-Jae | Park Eun-Young | Park Tae-Yun | Kim Sun-Kyung | Jeon Yeo-Jin |
| John Han (ep.7) | Mo-Ran (ep.7) | bully kid (ep.7) | apartment Resident (ep.7) | Lee Hye-Kyung (ep.8) |
 |
 |
 |
 |
 |
| Lim Jae-Hyuk | Yu Seung-Ok | Sim Jin-Hyeok | Han Dong-Kyu | Jung Eui-Soon |
| Kang Se-Young (ep.8,13-14,16) | Lala J (ep.9,12-15) | Lala J's fiance (ep.9,12,15) | Goo Pil-Soo's friend (ep.10-11) | Young-Ran (ep.11) |
 |
 |
 |
 |
 |
| Lee Moon-Soo | Jung Hyung-Suk | Lee Jae-Soon | Son Young-Soon | Kim Bong-Hee |
| Director Jang (ep.12,15-16) | Oh Gwang-Seok (ep.13) | Ok-Bun (ep.13) | taekwondo class attendee (ep.13) | taekwondo class attendee (ep.13) |
 |
 |
 |
 |
 |
| Lee Ha-Eum | Kim In-Kwon | Kim Si-Woo | Park Ju-Won | Lee Young-Eun |
| staff of Naeilui Hwajangdae app (ep.13,16) | restaurant owner (ep.13) | Gatcho 1234 (ep.14) | kid at Goo Pil-Soo's restaurant (ep.14) | Se-Ri (ep.14) |
 |
| Kim Dong-Hyun |
| Director Kim (ep.15) |
