The Virus Guest cast, played by Lee Sang In Episode 1x01: Episode 1 (Mar 1, 2013) Episode 1x02: Episode 2 (Mar 8, 2013) Episode 1x03: Episode 3 (Mar 15, 2013) Episode 1x05: Episode 5 (Mar 29, 2013) Episode 1x06: Episode 6 (Apr 5, 2013)