Composer
Director
Executive Producer
Screenwriter
Main Role
- Hyun BinYu Jin WooMain Role
- Park Shin Hye Main Role
Support Role
- Park HoonCha Hyun Suk [CEO of Neword Soft]Support Role
- Lee Seung JoonPark Sun Ho [Co-Founder of J One]Support Role
- Min Jin WoongSeo Jung Hoon [Jin Woo's secretary]Support Role
- Kim Eui SungCha Byung Jun [Hyung Suk's father]Support Role
- Kim Yong RimOh Yeong Shim [Hee Joo's grandmother]Support Role
- Lee ReJung Min Joo [Hee Joo's younger sister]Support Role
- Park Chan YeolJung Se Joo [Hee Joo's younger brother]Support Role
- Lee Hak JooKim Sang Beom [Hee Joo's friend]Support Role
- Jo Hyun ChulChoi Yang Ju [Head of R&D Center Research Team]Support Role
- Lee Shi WonLee Soo Jin [Jin Woo's first ex-wife & Hyung Suk's wife]Support Role
- Han Bo ReumGo Yoo Ra [Jin Woo's second wife]Support Role
- Park Jin WooNoh Yeong Joon [Yoo Ra's manager]Support Role
- Lee Jae WookMarco Han [Programmer / Hacker] (Ep. 8-9, 13)Support Role
Guest Role
- Park Hae Soo[Agent A] (Ep. 1, 2, 4, 8)Guest Role
- Kim Do Yeon[Tenant at Bonita Hostel/Medical Student] (Ep. 2, 3, 5)Guest Role
- Ryu AbelLee Soo Kyung [Soo Jin's sister] (Ep. 2, 4, 7)Guest Role
- Jung Min Sung[Hee Joo's father] (Ep. 3)Guest Role
- Choi Yoo Song[Hee Joo's mother] (Ep. 3)Guest Role
- Lee Chae YoonJung Hee Joo [Young] (Ep. 3)Guest Role
- Kim Joon EuiJung Se Joo [Young] (Ep. 3)Guest Role
- Park Chae HeeJung Min Joo [Young] (Ep. 3)Guest Role
- Lee Do Hyun[Korean Consulate representative] (Ep. 4-5)Guest Role
- Kang Ro Chae[J One Employee] (Ep. 4, 8)Guest Role
- Kim Hyun Mok[J One Employee] (Ep. 7, 10, 13, 16)Guest Role
- Park Seul KiHerself [Reporter] (Ep. 7, 16)Guest Role
- Hwang Bo Mi[Anchorwoman] (Ep.7, 16)Guest Role
- Son Kyung WonOh Yeong Sik [J One Director] (Ep. 11-13, 15-16)Guest Role
- Song Young KyuChoi Jung Hyuk [Doctor] (Ep.15)Guest Role
- Han Da Sol[Gamer] (Ep. 16)Guest Role
- Yoo Young Bin[Researcher]Guest Role
- Kim Joo Young[University student]Guest Role
- Park Sang Hwi[Granada Branch Officer]Guest Role
- Park Jong JinHimselfGuest Role
- Eom Seong SeopHimselfGuest Role
- Moon Jung Gi Guest Role
- Carla Avila Guest Role
Bit part
- Hong Boo Hyang Bit part
Unknown
- Bret Allan Lindquist Unknown
- Yoon Jae Hyun Unknown
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