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I remembered in the story that the seme is an author and the uke is a new editor. Seme is rich, owns a building, and is really famous. Seme had a traumatic experience I think. If I remembered it correctly, he once played the piano.
I really can't recall the title of that. I'm looking for it since I there was a sequel of that that I forgot as well.
Maybe this is the one that you're looking for
http://www.mangago.me/read-manga/mr_secret_floor_shousetsuka_no_tawamure_na_hibiki/
Maybe this is the one that you're looking for
http://www.mangago.me/read-manga/mr_secret_floor_shousetsuka_no_tawamure_na_hibiki/
What????