Gong Ryong (Lee Min-Ho) is an obstetrician and he is the prospective son-in-law for the largest chaebol group MZ. He has a secret mission that he can't tell anyone about. For his secret mission, he pays large sum of money to travel to the space station as space tourist. At the space station, Eve Kim (Kong Hyo-Jin) is stationed there. She is an elite space scientist and is currently on her first space station mission as a commander. She is a perfectionist who strictly follows rules and doesn't tolerate a single mistake in an area where dangers lurk everywhere. Her crew members including fruit fly research scientist Kang Kang-Su (Oh Jung-Se), who is the second son of a family that runs a global financial company.