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Park Ye-Young (Ma Eun-Soo)
*International LEO Station (ILS)
Lee Cho-Hee (Mina Lee)
Heo Nam-Jun (Lee Seung-Jun)
Alex Hafner (Santiago Gonzalez Garcia)
*MZ Group
Kim Eung-Soo (Choi Jae-Ryong)
Baek Eun-Hye (Na Min-Jeong)
Kim Kyung-Duk (Secretary Go)
Im Sung-Jae (Jeon Yi-Man)
Lee Doo-Seok (Choi Dong-Hun (ep.1))
Lee Yi-Rim (executive (ep.1))
Lim Yong-Soon (executive (ep.1))
Sung Chan-Ho (executive (ep.1))
Kim Sung-Ho (security personnel (ep.1))
Park Se-Hoon (security personnel (ep.1))
Seo Jin-Won (executive (ep.2))
*Keluarga Gong Ryong
Jeon Soo-Kyeong (Ji Hwa-Ja)
Choi Jung-Won (Jang Mi-Hwa)
Jung Young-Joo (Jung Na-Mi)
Kim Jin (Gong Ryong's mom (ep.1))
*Lainnya
Cho Jung-Seok (anchorman (ep.1-2))
Park Jin-Joo (Kim So-Yeon (ep.1))
*Anggota Pemeran Tambahan
Seo Myung-Chan - Korea Space Agency representative (ep.1)
Kim Kwon - MZ Group employee (ep.2). (Tribun-Timur.com/ Sakinah Sudin)