Composer
Director
Screenwriter
Main Role
- Jun Ji Hyun Main Role
- Lee Min Ho Main Role
Support Role
- Lee Hee JoonJo Nam DooSupport Role
- Shin Won HoTae OhSupport Role
- Park Ji IlManager NamSupport Role
- Shin Hye SunCha Shi AhSupport Role
- Moon So RiAhn Jin JooSupport Role
- Lee Ji HoonHeo Chi HyunSupport Role
- Park Hae SooHong Dong PyoSupport Role
- Hwang Shin HyeKang Seo HeeSupport Role
- Sung Dong IlMa Dae Yeong / Mister YangSupport Role
- Na Young HeeMo Yoo RanSupport Role
- Park Jin YoungHeo Joon Jae [Young]Support Role
- Shin Eun SooSe Hwa / Shim Chung [Young] (Ep. 3, 4 ,13)Support Role
- Jeon Jin SeoHeo Joon Jae [Child]Support Role
- Gal So WonShim Chung [Child]Support Role
- Hong Jin Kyung[Homeless woman and Chung's friend]Support Role
- Choi Jung WooHeo Il JoongSupport Role
- Shin Rin AhSeo Yoon AhSupport Role
- Shim Yi YoungMoo Yoo Ran [Young]Support Role
- Jung Moon SungHeo Gil Joong [Young]Support Role
- Oh Yeon Ah[Mr. Yang's fiance]Support Role
- Lee Jae WonCha Dong Shik [Jin Joo's Husband]Support Role
- Park Myung Shin[Chief Nam's wife]Support Role
- Sung Chang Hoon[Yang's man}Support Role
- Kim Jae IlYoo Shi Joon [Prosecutor]Support Role
- Lee Ho JaePsychologist Jin Kyung-Won / Fortune Teller [Past]Support Role
Guest Role
- Krystal JungMin Ji [Flight attendant]Guest Role
- Cha Tae Hyun[Con man]Guest Role
- Ahn Jae HongKim Bong Seok "Missionary Thomas"Guest Role
- Choi Kwon[Gil Joon's secretary - Young]Guest Role
- Kim Sung RyungJang Jin-ok (Ep. 1-3)Guest Role
- Lee Chae KyungSister Shin (Ep. 2)Guest Role
- Seo Beom Shik[Gangster] (Ep. 2)Guest Role
- Kim Hye Yoon[Jang Jin Ok's daughter] (Ep. 3)Guest Role
- Seo Dong Won[Aquarium manager] (Ep. 3-4)Guest Role
- Seo In Sung[Boy bumps Sim Chung] (Ep. 3-4)Guest Role
- Kim Kang Hyun[Police officer] (Ep. 5)Guest Role
- Park Jin Joo[Nurse] (Ep. 6)Guest Role
- Kim Byung Chun[Vice President of Hospital] (Ep. 6.)Guest Role
- Kim Soo Jin[Kim Yae Eun's mother] (Ep. 6)Guest Role
- Jo Jung SukYoo Jong Hoon [Merman] (Ep. 7-8)Guest Role
- Jung Yoo MiKim Hee Jin (Ep. 8)Guest Role
- Go Gyu PilHan Seong Tae (Ep. 9)Guest Role
- Im Won Hee[Doctor] (Ep. 19)Guest Role
- Kim Seul Gi[Mermaid] (Ep. 20)Guest Role
- Kim Ji AnKang Seo Hee [Young]Guest Role
- Kim Sun Young[Woman at sauna]Guest Role
- Lee Su Ryeon[Personal Shopper]Guest Role
- Gu Da Song[Curious student]Guest Role
- Kim Oh Bok[ER doctor]Guest Role
- Lee Yu Jin[Woman @ open-air bath]Guest Role
- Kim Yoon Tae[Lawyer]Guest Role
- Noh Yi HanMa Dae Young [Child]Guest Role
- Kang Ro Chae[Lead female character on TV]Guest Role
- Kim Dae HyunSu HaGuest Role
- Park Sook Myung[Resident]Guest Role
- Oh Yoo Mi[Mother with baby]Guest Role
- In Sung Ho Guest Role
- Gi Yeon Ho Guest Role
- Kim Tae Young Guest Role
- Choo Soo Bin Guest Role
- Myung Seok Geun Guest Role
- Park Seung Joon[Kid in picture]Guest Role
- Kook Joong Woong Guest Role
- Choi Chan Ho Guest Role
- Seo Jeong Woo[High school student]Guest Role
- Kim Jung Seok[Police Chief]Guest Role
- Oh Jin Ha[Gisaeng]Guest Role
- Kim Joo Ah[Aqua Planet mother]Guest Role
- Jung Tak[Boy in photo] (Ep. 11)Guest Role
Unknown
- Carson AllenMermaidUnknown
- Kim Ok Joo Unknown
- Kang Du Hyun Unknown
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