Angma Imsi Boho Jung!

Historia

Ryu Dan-woo, an ordinary college student, gets "chosen" (?) by a young demon he meets on the street. The demon follows him into his apartment without permission and settles in, and from that day on, Dan-woo's once-ordinary life goes completely awry. In order to return to his normal life, he begins searching for clues to dimensional magic together with his college classmate Siduk and the witch Jueun…

Sinopsis vía AniList (en inglés).