Screenwriter
Main Role
- Kim Dong WookDongbang Yu BinMain Role
- Park Ji HwanMu Jung RyeokMain Role
- Seo Hyun WooJung Jeong HwanMain Role
- Park Se WanSeo Min SeoMain Role
- Lee Seung WooJang Tan SikMain Role
Support Role
- Son Eun SeoJung Eun Gyeong [National research institute’s head]Support Role
- Kim Seung HwaNam Yeong Eun [Jeong Hwan's wife]Support Role
- Kim Ra OnDong GuSupport Role
- Kim Si GyeongSeo Hyeon Seo [Min Seo's sister]Support Role
- Han Dong HeeSong Jae In [Doctor]Support Role
- Choi Kwang IlKang Hui Ryong [Chief of police]Support Role
- Ahn Sang WooJung Jin Gyu [Songwon police station chief]Support Role
Guest Role
- Han Ji WonJung Hyeon Ju [Art student]Guest Role
- Kang Sung HoonCaptain Yun (Ep. 1)Guest Role
- Ko Kyung Man[Police officer] (Ep. 1)Guest Role
- Kim Kwan Jang[Apartment man] (Ep. 1)Guest Role
- Lee Jae Soon[Apartment resident] (Ep. 1)Guest Role
- Kim Joong DonJang Tae Sik (Ep. 1-3)Guest Role
- Hwang Chan SungKang Min Jae (Ep. 1-3)Guest Role
- Son Yong BeomIm Dong Il (Ep. 1-3)Guest Role
- Lee Joo Ye[JMT Entertainment staff] (Ep. 1)Guest Role
- Kim Sa Hun[TV program prosecutor] (Ep. 2-3)Guest Role
- Joo Boo Jin[Restaurant owner] (Ep. 2, 5, 11, 13, 15, 17, 20)Guest Role
- Jeong Young Do[TMT Entertainment CEO] (Ep. 3)Guest Role
- Kim Tae YoungKim Seon Hwa [JMT secretary] (Ep. 3)Guest Role
- Oh Hyun SooO Sang Su (Ep. 4)Guest Role
- Ahn Do KyuLee Ji Ung (Ep. 4-6)Guest Role
- Geum Kwang SanKang Sang Du (Ep. 4-5)Guest Role
- Sung No JinYun Min Su (Ep. 4-6)Guest Role
- Han Ye JiYun Hyo Ju (Ep. 4-6)Guest Role
- Moon Hye Rin[Hyo Ju's friend] (Ep. 4-5)Guest Role
- Kim Ik TaeSong Sang Uk (Ep. 5)Guest Role
- Ban Hye YoungDr. Kim Hyeon Su (Ep. 5)Guest Role
- Lee Eun Mi[Neighborhood woman] (Ep. 5, 9)Guest Role
- Yoon Jae ChanNam Jung Hyeon (Ep. 5-6, 10)Guest Role
- Jun Joon Woo[Nam Jung Hyeon's attorney] (Ep. 5, 10)Guest Role
- Ahn Bok Ja[Grandmother] (Ep. 6)Guest Role
- Seo Kwang Jae[Toy Paradise owner] (Ep. 6)Guest Role
- Jung Hyun SeokKim Han Du (Ep. 7)Guest Role
- Kim Byung ChunKo Chu Seon (Ep. 7)Guest Role
- Hong Min Soo[Bar owner] (Ep. 7)Guest Role
- Chu Yeon Gyu[Bar customer] (Ep. 7)Guest Role
- Park Bin[Bar customer] (Ep. 7)Guest Role
- Jung Young Keum[Yu Na’s grandma] (Ep. 7)Guest Role
- Bang So Min[Daycare employee] (Ep. 7)Guest Role
- Jang Yo HoonYun Seo Hun (Ep. 7-8)Guest Role
- Kim Da HwinChu Yong Jin (Ep. 7-8)Guest Role
- Park Woo YoungLee Chang Su [Teen] (Ep. 8)Guest Role
- Lee Gun changChu Yong Jin [Teen] (Ep. 8)Guest Role
- Bo Ra Na[Restaurant owner] (Ep. 8)Guest Role
- Go Seo HeeLee Mi Jeong (Ep. 8)Guest Role
- Moon Hak Jin[Alumnus] (Ep. 8)Guest Role
- Park Hyung Soo[Special investigation leader] (Ep. 8)Guest Role
- Kim Joon Hwan[Passerby] (Ep. 9)Guest Role
- Kim Jin Seo[Socks employee] (Ep. 9)Guest Role
- Lee Ha Joo[Arrested scammer] (Ep. 9)Guest Role
- Lee DabitnaHye Bin (Ep. 11)Guest Role
- Min Ha Ram[Apartment resident] (Ep. 11)Guest Role
- Jo Deok HeeJi Seok (Ep. 11-12)Guest Role
- Jeon Soo JiHyeon A (Ep. 11-12)Guest Role
- Son Young HeeKim Ji Min [Crime show producer] (Ep. 11-12, 17)Guest Role
- Lee Choong JooSim Hyeon U [Professor, profiler] (Ep. 11-13, 16-20)Guest Role
- Joo Ha Yeon[Bride] (Ep. 12)Guest Role
- Yu Ha Yeon[Shaman] (Ep. 12)Guest Role
- Lee Kun Goo[Criminal] (Ep. 12)Guest Role
- Suk Yoon Ho[Hyeon A’s dad] (Ep. 12)Guest Role
- Ahn Hyun Jung[Hyeon A’s mom] (Ep. 12)Guest Role
- Park Jeong Seo[Crime group boss] (Ep. 12)Guest Role
- Daniel C. Kennedy[FBI agent at bar] (Ep. 12)Guest Role
- Seo Eun Joo[Neighborhood woman] (Ep. 12)Guest Role
- Shin Chul Jin[Victim] (Ep. 13-14)Guest Role
- Min Eung ShikKim Jong Su [Professor] (Ep. 13)Guest Role
- Jo Wan KiHan Jun Ho (Ep. 12-13, 17, 19)Guest Role
- Jang Ji HooPark Ji Hu (Ep. 13)Guest Role
- Seo Jang Hyun[Ji Hu's friend] (Ep. 13)Guest Role
- Woo HyunSeo Jang Su (Ep. 14)Guest Role
- Jung Sun ChulMr. Jun (Ep. 14)Guest Role
- Seo Jin WonCheon Il Yeong [Midam Gallery] (Ep. 14)Guest Role
- Lim Jae HyeokByeon Cheol Yeong (Ep. 16)Guest Role
- Kim Bum SooYun Jae Hyeong [Lawyer] (Ep. 16)Guest Role
- Jo Ryeon[Cheol Yeong's mother] (Ep. 16)Guest Role
- Choi Si AJeon Hyeon Ju [Victim] (Ep. 17)Guest Role
- Kim Sun Hyuk[Crime scene technician] (Ep. 17)Guest Role
- Choi Jung Heon[Pervert] (Ep. 17)Guest Role
- Han Sa Myung[Luna Bar manager] (Ep. 18)Guest Role
- Lee Ha NeeChoi Jeong Su (Ep. 18)Guest Role
- Sung Nak Kyung[Gambling den boss] (Ep. 18)Guest Role
- Kim Young OkHong Tan Bong [Tan Sik's grandmother] (Ep. 19)Guest Role
- Woo Kang Min[Voice Phishing gang boss] (Ep. 19)Guest Role
- Lee Jae JoonSim Hyeon U [Young] (Ep. 20)Guest Role
- Lee Dong HyunSon Tae SeongGuest Role
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