Odyssey is a Manga/Manhwa/Manhua in english language, Drama series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

The unrealistic dream of becoming an ‘astronaut’. The trial that came just before it was about to come true… After 15 years, Sung Eunha, who works for NASA as an astronomer rather than an astronaut, is subject to research suspension for unknown reasons. To solve the mystery, NASA’s gigantic project is about to begin… Will Sung Eunha’s dream come true this time?