| Episode credited cast: |
 | Joon-Gi Lee | - | Lee Soo-hyun / Kay (as Jun-ki Lee) |
 | Sang-mi Nam | - | Seo Ji-woo / Ari |
 | Kyung-ho Jung | - | Kang Min-ki (as Kyung Ho Jung) |
 | Jae-Sung Choi | - | Mao Liwart |
 | Kyung Soon Jung | - | Oh Seung-joo (NIS Supervisor) |
 | Kap-su Kim | - | Jung Hak-soo (Director / Chief Jung) |
| Ji-ho Choi | - | Ji Ra-peu, Giraffe |
| Sung Mo Jung | - | Seo Young-kil |
| Hyo-jun Park | - | Ah-hwa |
| Rest of cast listed alphabetically: |
| Choong-min Hong | - | Ji Woo's mother |
| Gi-yeong Lee | - | Kang Joong Ho / Min Gi's father |
| Gun-Tae Park | - | young Soo Hyun |
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