Door is a Manga/Manhwa/Manhua in (English/Raw) language, Manhwa series, english chapters have been translated and you can read them here. You are reading Door chapters on, fastest updating comic site. The Summary is

Dr, Hwan Ryu, world’s first inventor of a teleportation gate (Pluto) has top engineer “Erica Choi” pass through it as part of a demonstration. As “Erica” passes through safely, excitement over Pluto’s scientific results is triggered among the global press. But after her journey through Pluto, “Erica Choi” is possessed by an unknown power and shows abnormal behavior, going so far as kill people who try to stop Pluto’s development. Meanwhile, Chaesong and her friend Gahyeok are stuck between Erica’s faction who wants Pluto’s expansion, and the opposing group who is trying to stop her. Together, Chaesong and Gahyeok struggle to find out the secrets between Pluto, and what more it might be hiding…

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