Guest Stars Lee Ji Ah as Kang Yoon Hee Go Doo Shim as Byun Yo Soon Kim Min Suk as Yeo Hyung Gyu Seo Hyun Woo as Section Chief Song Song Sae Byuk as Park Gi Hoon Chae Dong Hyun as Assistant Manager Kim Park Ho San as Park Sang Hoon Kim Young Min as Do Joon Young Jang Ki Yong as Lee Gwang Il 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 Seo Sang Won as Sang Hoon's Friend Oh Na Ra as Jung Hee Jung Hae Kyun as Park Dong Woon Kwon Na Ra as Choi Yoo Ra Shin Goo as CEO Jang Shin Dam Soo as Jung Chang Mo Lee Young Suk as Chun Dae