In Tree City, Metronome works in secret to keep all things in balance. Adel, its charismatic director, hires the former champions of the Running Man competition as agents. Among them is Adel’s protégé, Lema. One day the Running Men inexplicably begin committing crimes throughout the city. Adel recognizes the threat and mobilizes Metronome to rise from the darkness to face them. Lema, shocked by the Running Men’s sudden transformation, decides to pursue her own investigation in order to prevent a devastating war…
| Actor | Role |
|---|---|
| KKim Seo-youngNot listed | Not listed |
 Kwon Chang-ukNot listed | Not listed |
 Um Sang-hyunNot listed | Not listed |
 Kim Yeon-wooNot listed | Not listed |
 Kang Shi-hyunNot listed | Not listed |
 Jeon Tae-yeolNot listed | Not listed |