Hyun Bin as Kim Joo Won
Ha Ji Won as Gil Ra Im
Yoon Sang Hyun as Choi Woo Young/Oska (Joo Won’s cousin)
Kim Sa Rang as Yoon Seul
Lee Philip as Im Jong Soo
Lee Jong Suk as Han Tae Ssun
Yoo In Na as Im Ah Young
Kim Ji Sook as Moon Yeon Hong
Park Joon Geum as Moon Boon Hong
Kim Sung Oh as Kim Sung Woo (Joo Won’s secretary)
Choi Yoon So as Kim Hee Won (Joo Won’s sister)
Kim Sung Kyum as Moon Chang Soo
Lee Byung Joon as Park Bong Ho
Sung Byung Sook as Park Bong Hee
Yoon Gi Won as Choi Dong Kyu
Yoo Seo Jin as Lee Ji Hyun
Kim Gun as Yoo Jong Heon
Baek Seung Hee as Park Chae Rin
Jang Seo Won as Hwang Jung Hwan
Kim Dong Gyoon as director
Kim Mi Kyung as guest house ahjumma
Nam Hyun Joo as Director Nam
Lee Tae Woo as Ra Im’s son
Song Yoon Ah as herself (cameo)
Lee Joon Hyuk as himself (cameo)
Beige (cameo)
Baek Ji Young as herself (cameo, ep 13)
Han Ye Won as Cherry (cameo, ep 15)
Son Ye Jin as herself (cameo, ep 20)
Kang Chan Yang
Kim Sung Hoon
Sa Hee