Cast (in credits order)
| Ju Ji-hoon | ... | Kang Gon / Kim Sung-kyu | |
| Jin Se-yeon | ... | Shin So-Young | |
| Kim Kang-woo | ... | Jo Se-hwang (as Kang-woo Kim) | |
| Kim Yoo-ri | ... | Han Yoo-na (as Yoo-Ri Kim) | |
| Rest of cast listed alphabetically: | |||
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Kim Byeong-ki | ... | Jo Gwan (as Byeong-ki Kim) |
| Lee Dae-yeon | ... | Shin Goo-cheol (as Dae-yeon Lee) | |
| Kim Do-hyun | ... | Choi Ho-Joon | |
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Lee Ji-wan | ... | Kim Ho-yeon |
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Lee Joo-eun | ... | Hye-soo (as Sang-in Lee) |
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Lee Jung-Hyun | ... | Ko Dae-Soo |
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Kim Seung-hun | ... | Special prosecutor Han Hyeong |
| Park Won-sang | ... | Goo Dong-yeong (as Won-sang Park) | |