Guest Stars Yoo Dong Geun as Kwon Yong Gwan Jung Ho Bin as Kang Chul Hwan Oh Yoon Ah as Oh Sook Kyung Do Ye Sung as Jung Kyung Won Lee Han Wie as Park Sung Chul Kim Young Ae as Choi Jin Hee Lee Jung Gil as Jo Myung Ho Kim Seung Woo as Park Chul Young Jun Gook Hwan as Han Jung Pil Cha Do Jin as Oh Dae Shik Ahn Jin Kyung as Athena Operative Arnold Hong as Suk Joon Jung Man Shik as Jae Hyuk Kim Yoon Tae as Jerome Lee Han Sol as Young Min Lee Jae Yong as Kim Ho Gyun Jung Chan Woo as Chul Kyu Jung Dong Kyu as Doosan Heavy Industries Nuclear Physicist