Jacky Cheung Hok-Yau as Professor C.Y. Siu / Helios

Nick Cheung Ka-Fai as Lee Yan Ming, Eric

Shawn Yue as Fan Ka Ming

Chang Chen as Gam Dao Nin / Messenger of Helios

Wang Xueqi as Song An

Ji Jin-hee as Choi Min Ho

Choi Si-won as Park Woo Cheol

Janice Man as Zhang Yijun / Messenger of Helios

Yoon Jin-yi as Sin Mi Kyung

Joyce Feng as Yuan Xiaowen (Chief Secretary of Mr. Song)

Philippe Joly as Younger Mr. BIG's Thug

Kim Hye-yoon as Park Woo Cheol's Sister

Kim Hae-sook as Park Young Sook (Director of NIS)

Lee Tae-ran as Yoon Hee Seon (Choi Min Ho's Wife)

Philip Keung Ho-Man as Wong Kin Chung

Paul Fonoroff as Martin Koo

Josephine Koo Mei-Wah as Sophia

Ken Law Ho-Ming as Lee Yan Ming's Subordinate

Jerry Leung Ho-Kai as Lee Yan Ming's Subordinate

Tracy Chu as Lee Yan Ming's Subordinate

Benny Li Shun-Yan as Representative of Hong Kong Customs

Eric Chung as Representative of LCSD

Ben Yuen Foo-Wah as Representative of Transport Department

Timothy Cheng Chi-Sing as Representative of Fire Services

Rachel Kan as Representative of Hospital Authority

Suk-Yee Chan as Director of Immigration

Gill Mohindepaul Singh as Saad

Icy Wong as Female Reporter

Ji Dae-han as Korean Ambassador

Park Jeong-hak as Marine Police of Korea

Eddie Ho Wai-Yip as Fan Ka Ming's Subordinate

Luk Man-Wai as Fan Ka Ming's Subordinate

Hedwig Tam as Fan Ka Ming's Subordinate

Mike Leeder as Younger MR. BIG / Older MR. BIG

Singh Hartihan Bitto as Younger Mr. BIG's Thug

Semiquaver Iafeta as Younger Mr. BIG's Thug

Zhang Chaoli as Xiao Li (Senior Secretary of Mr. Song)

Gilbert Bae as Manager of Raw Material Plant Factory

Frank K.H. Kim as Manager of Raw Material Plant Factory

Kim Yanghyeong as M.C. at Choi Min Ho's Son's Birthday Party

Ha Woojung as Choi Myeong Gun (Choi Min Ho's Son)

Park Jaeyoung as Choi Myeong Gun's Grandfather

Kim Hyunsook as Choi Myeong Gun's Grandmother

Noah Wong Man-Nok as Hacker

Duncan Cheung as Hacker Assistant

Vincent Chi Mo-Chun as Superintendent of Macau Police