A writer looking for inspiration finds a perfect muse in a girl. After much work, he makes her his girlfriend. But then he starts to get tired of her.
| Actor | Role |
|---|---|
 Ha Jung-wooGoo Joo-wol / Detective Ma Dong-wook | Goo Joo-wol / Detective Ma Dong-wook |
 Kong Hyo-jinLee Hee-jin / Kim Hae-young | Lee Hee-jin / Kim Hae-young |
 Yoo In-naSoo-jung / Kyung-sook | Soo-jung / Kyung-sook |
 Jo Hee-bongPublisher Kwak / Detective Squad Chief Kwak | Publisher Kwak / Detective Squad Chief Kwak |
 Lee Byung-joonM | M |
 Ji Jin-heeGoo Joo-ro | Goo Joo-ro |
 Kwak Do-wonDirector Hwang | Director Hwang |
 Seo Hyun-wooYi-gyu | Yi-gyu |
 Son Byung-wookJuwol's Homeroom Teacher | Juwol's Homeroom Teacher |
 Jeon Su-jiArt Teacher | Art Teacher |
| CChoi Won-taeBaek Sun-il | Baek Sun-il |
 Kim Jae-hwaJoo-hee | Joo-hee |
 Park Jun-myunBaek Sun-young | Baek Sun-young |
 Lee Jun-hyeokProfessor Jeong | Professor Jeong |
 Teo YooSecretary | Secretary |
 Kim Ji-hoonDetective | Detective |
 Park Young-sooYoung-shik / President Jo | Young-shik / President Jo |
 Cha Eun-jaeHair shop | Hair shop |