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Red Mansion (▰˘◡˘▰)
Link: https://www.mangago.me/read-manga/red_mansion/
Yess, thank u so much~~
You even provided the link
The setting was in a closed apartment? Similar to a prison? The mc takes care of a convenience store. The ML is a kind like a top dog there. I don't think it's horror, leaning towards psychological.
I appreciate anyone who's trying to help~~