Ji Chang Wook
Ma Dong Chan
Main Role
Won Jin Ah
Go Mi Ran
Main Role
Yoon Se Ah
Na Ha Young
Main Role

Im Won Hee
Son Hyun Ki [Producer]
Support Role
Shim Hyung Tak
Hwang Byung Shim / Hwang Dong Hyuk [Mi Ran’s ex-boyfriend / College professor]
Support Role
Kim Won Hae
Ma Dong Shik [Dong Chan's younger brother] | Ma Pil Go [Dong Chan's father] (Ep. 2)
Support Role
Jeon Soo Kyung
Ma Dong Joo [Dong Chan's sister]
Support Role
Yoon Seok Hwa
Kim Won Jo [Dong Chan’s mother]
Support Role
Jung Hae Kyun
Kim Hong Seok [CEO of TV Show broadcasting]
Support Role
Park Choong Seon
Go Yoo Han [Mi Ran's father]
Support Role
Kil Hae Yeon
[Mi Ran's mother]
Support Role
Seo Hyun Chul
Hwang Gap Soo [Bio-research professor]
Support Role
Seo Jung Yeon
Oh Young Sun [Byung Shim's wife]
Support Role
Park Hee Jin
Park Kyung Ja [Mi Ran's friend]
Support Role
Oh Ah Rin
Ma Seo Yoon [Dong Shik's daughter]
Support Role
Lee Moo Saeng
Jo Ki Beom [Gap Soo's aide]
Support Role
Yoon Na Moo
Go Nam Tae [Mi Ran's little brother]
Support Role
Choi Bo Min
Hwang Ji Hoon [College Student / Byung Shim's son]
Support Role
Kang Yoo Seok
Park Young Joon [Hwang Ji Hoon's friend]
Support Role
Hong Seo Baek
Producer Lee
Support Role
Han Jae Yi
PD So
Support Role
Nam Min Woo
Kim Ji Oh [PD]
Support Role
Lee Do Yup
Baek Yeong Tak [Detective / Dong Joo's ex-husband]
Support Role
Kim Bup Rae
Lee Seok Du / Lee Hyeong Du [CEO of Unsung group]
Support Role
Jeon Jin Oh
[Seok Du's secretary]
Support Role
Lee Bong Ryun
Park Yoo Ja [Fortuneteller]
Support Role
Kim Min Chul
[Teacher Assistant]
Support Role
Lee Joo Young
Lee Hye Jin [Dong Sik's wife]
Support Role

Lee Byung Hun
Kim Jin [1999's Hyun Gi's aide] (Ep. 1-2, 10)
Guest Role
Lee Hong Ki
Son Hyun Gi [1999 self] (Ep. 1-2, 10)
Guest Role
Cha Sun Woo
Hwang Byung Shim [1999 self] (Ep. 1-2)
Guest Role
Chae Seo Jin
Na Ha Young [1999 self] (Ep. 1-3)
Guest Role
Oh Ha Nee
Park Kyung Ja [1999 self] (Ep. 1-4, 11)
Guest Role
Song Ji Eun
Oh Young Sun [1999 self] (Ep. 1-4)
Guest Role
Kang Gi Doong
Ma Dong Shik [1999 self] (Ep. 2, 11)
Guest Role
Han Da Sol
Ma Dong Joo [1999 self] (Ep. 2)
Guest Role
Lee Do Gyeom
Baek Yeong Tak [1999 self] (Ep. 1-2)
Guest Role
Park Min Su
Go Nam Tae [Child] (Ep. 1-3)
Guest Role
Tony Ahn
Himself [Award show MC] (Ep. 1)
Guest Role
Robin Deiana
Nikolai [Killer] (Ep. 1)
Guest Role
Kim Wook
Jo Ki Beom [1999 self] (Ep. 1-3)
Guest Role
Choi Ri
[Woman who rides water-bike with Byung Shim] (Ep. 1)
Guest Role
Seo Sang Won
Dr. Yoon (Ep. 3-4, 6, 12)
Guest Role
Im Jae Geun
[Music store owner] (Ep. 3)
Guest Role
Choi Na Moo
[Police officer] (Ep. 3)
Guest Role
Yang Hyun Min
[Thug] (Ep. 5-6)
Guest Role
Ra Mi Ran
Kang Ok Bong [Panelist] (Ep. 6)
Guest Role
Kim Soo Ro
Yoo Ji Min [Panelist] (Ep. 6)
Guest Role
Jung Myung Joon
Yoo Woo Jun [Panelist] (Ep. 6)
Guest Role
Jung Sung Ho
[Debate show MC] (Ep. 6)
Guest Role
Kwon Hyuk Soo
[President of South Korea] (Ep. 6)
Guest Role
Kim Jong Goo
Kim Shi Seok [Hong Seok's boss] (Ep. 7-8, 12)
Guest Role
Yoon Joo Man
Terry Kim / Kim Hyeon Do [Lee Seok Du's Hitman] (Ep. 7, 9-12, 14-15)
Guest Role
Han Ki Woong
Lee Jung Woo [Lee Seok Du's son] (Ep.12-13)
Guest Role
Park Jin Young
Jang Woo Shin [Man who wants to go inside the cryonic capsule] (Ep.14)
Guest Role
Choi Dae Sung
Kim Jin [Present self]
Guest Role
Yeom Dong Hun
Seo Yoon Suk [professor]
Guest Role
Henny Savenije Guest Role
Lee Gyu Sub Guest Role
Jang Ye Rim
[Experiment woman]
Guest Role
Joo Byung Ha
[Police officer]
Guest Role
Amy Aleha
[News anchor]
Guest Role
Kang Ro Chae
Nurse Seol Soo Jin
Guest Role
Choi Soo Hyun
[Nurse]
Guest Role
Lee Kwang Ik
[Employee]
Guest Role
Kim Do Won
[Telescope kid]
Guest Role
Nam Ga Seol
[Young Joon's fling]
Guest Role
Song Hoon
[Ma Dong-Ju's ex-husband]
Guest Role
Kim Jae Cheol
Reporter Kim Wu Se, Wonders Media (Ep 6)
Guest Role