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Hyun-dong is a hikikomori. He lives off of the joy of assembling and displaying Gundams in his only space, his home. Then one day, he makes a big decision to go out to buy a Gundam plastic model that a delivery man left next to his door. At that moment, the front door slams shut. He is trapped in an unfamiliar world, he can't remember the password and he decides to go on a long journey to find the key house.
An ordinary housewife In-yeong meets carpenter Hui-su by chance in a café and for fun they decide to become coffee mates: friends who only meet in cafés and nowhere else. In a café, they share everything, from their daily routines to their deepest secrets, which have never been shared with anyone before.
A look into the friendship of Yeon-jun, Soo-bin, Beom-gyu, Tae-hyun and Huening Kai as they travel to a Narnia-like island, and what happens when their repressed issues come out.
