Guest Stars Lee Ji Ah as Kang Yoon Hee Go Doo Shim as Byun Yo Soon Kim Young Min as Do Joon Young Kim Min Suk as Yeo Hyung Gyu Seo Hyun Woo as Section Chief Song Song Sae Byuk as Park Gi Hoon Park Ho San as Park Sang Hoon Chae Dong Hyun as Assistant Manager Kim Jung Jae Sung as Yoon Sang Tae Jun Gook Hwan as Executive Director Wang Ryu Abel as Jung Chae Ryung Park Soo Young as Lee Jae Chul Son Sook as Lee Bong Ae Ahn Seung Kyun as Song Ki Bum Jung Hae Kyun as Park Dong Woon Oh Na Ra as Jung Hee Seo Sang Won as Sang Hoon's Friend Kwon Na Ra as Choi Yoo Ra Lee Do Hyun as Kwon Shik Shin Goo as CEO Jang Shin Dam Soo as Jung Chang Mo Park Hae Joon as Gyum Duk