Coming from two different backgrounds, Gong Ryong and Eve Kim embark on a space mission. However, problems arose after they launched, endangering the expedition

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Upon arriving in space, Ryong panics when Eve threatens to ruin his secret mission. Soon after, a crisis forces Ryong to try something completely new

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Determined to carry out the secret mission himself. Ryong tries to circumvent Kang Kang-su. During a space walk, Eve experiences a sudden problem.

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With Eve's life in jeopardy, Ryong watches helplessly - as protocol prevents him from saving her. With every passing second, she loses precious oxygen.

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Following Ryong's sudden confession, Eve discovers a hurtful truth unfolding back on Earth. Soon, she learns of an even more disturbing reality in space.

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Eve discovers an unethical secret, forcing her to act decisively despite Ryong's objection - which drives him to take matters into his own hands.

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After Ryong learns the results of his experiment, a potential calamity approaches the crew - threatening his safety and the survival of his work.

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Eve risks everything to heroically rescue Ryong, facing treacherous danger. However, returning home seems increasingly improbable.

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With Ryong and Eve stranded in space, those on Earth scramble to save them - albeit for different reason. Park Dong-a steps forward to take the risk.

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Despite their promises in space, Ryong and Eve return to earthly realities - facing duty, recovery, suspicions, confessions and lingering longing.

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While Ryong and Eve adjust to normal life, Chief Kang requests a detailed report of their time in space - leading them to agonize over their story.

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Choi Go-eun confronts Eve after encountering her at Ryong's place. Chief Kang advises Eve not to see Ryong again - despite Eve's true desires.

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Chief Kang summons Ryong and Kang Kang-su regarding their forbidden experiment in space. Eve uncovers a painful truth about her past.

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A deployed investigative team discovers Ryong's cell phone in space - sparking an inquiry into who is responsible for the unauthorized events

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As Eve's new state prevents her from coming back to Earth, Ryong commits to joining her in space. Once there, they debate a risky return to Earth.

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