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Underhouse (公寓之下) is a Chinese AU which takes place in the Ebott Apartment and Human and Monster are living peacefully thanks to the Peace Agreement.
Frisk is a 18-year-old college student who is sharing the same room with Sans. She is the new Human lodger.
Sans is a skeleton who is sharing the same room with Frisk, who likes to hang on with him. He runs a illegal hot dog store and he is a makeshift professor.
Papyrus is a member of urban management and a courier. He is Sans' younger brother and likes cooking spaghetti.
- In this AU, Papyrus' spaghetti is considered as the most destructive food by many people (At least Frisk, Sans, Undyne, Alphys, Toriel, Asgore, Mettaton, Gerson, Mad Dummy, Chara, Asriel, Muffet) and it can even make Mettaton's system down. However, Papyrus can't taste it.