A mystery crime thriller about a man who calls himself Master and sends mysterious texts with images of young women that they don't remember taking. A teacher and a former detective become involved in the escalating series of crimes.
| Actor | Role |
|---|---|
 Lee You-youngHan Seo-rin | Han Seo-rin |
 Kim Hie-wonOh Guk-cheol | Oh Guk-cheol |
 Oh Ha-neeYang Se-jeong | Yang Se-jeong |
 Lee Hak-juKim Dong-jin | Kim Dong-jin |
 Kim Da-miYu Min-ah | Yu Min-ah |
 Kim Young-sunHan Soon-jeong | Han Soon-jeong |
 Lee Je-yeonKim Jin-ho | Kim Jin-ho |
 Jang Hyuk-jinJo Young-jae | Jo Young-jae |
 Son Kang-gookChoi Kyu-dong | Choi Kyu-dong |
 Ko Kyu-pilDetective Moon | Detective Moon |
 Lee Jae-hyeokDetective | Detective |
 Jung Woo-jinJin-ho's friend | Jin-ho's friend |
 Im Seo-eunDetective Yoon | Detective Yoon |