Oh Dong-sik is the completely rigid character who has always led a text-book life. Dong-sik is threatened by loan sharks when his mother signs up for a private loan in order to advance Dong-sik’s father’s promotion into the principal position. Dong-sik decides to become the best insurance seller in his newly transferred insurance sales team, but sales is a major challenge for the completely tactless and obstinate Dong-sik. Then one day, Dong-sik has a chance encounter with Hyugosoo, the legendary ‘master of tongue’ of insurance sales industry. Hyugosoo bends his rules and accepts Dong-sik as his pupil, and Dong-sik begins to learn Hyugosoo’s secrets of flattery after a great struggle. Will his teachings indeed reinvent Dong-sik into ‘Mr. Ass-Kisser’?
| Sound | Choi Tae-young | Sound Supervisor |
| Production | Syd Lim | Producer |
| Sound | Gang Hye-yeong | Sound Designer |
| Camera | Park Hong-yeol | Director of Photography |
| Writing | Kwon Sung-hui | Adaptation |
| Art | Yang Hong-sam | Set Decoration |
| Writing | Mun Chee Yong | Adaptation |
| Camera | Jee Yune-jeong | Camera Operator |
| Production | Choi Tae-young | Producer |
| Directing | Jeong Seung-koo | Director |
| Writing | Jeong Seung-koo | Writer |
| Sound | Hyun Jee-yoon | Dialogue Editor |
| Production | Kang Jin | Line Producer |
| Art | Jin Hoon | Props |
| Costume & Make-Up | O Chang-ryeol | Makeup & Hair |
| Crew | No Hyeong-gi | Stunts |
