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It's not here on mangago, but you can check it on bato to. It's uploaded there under the title "The Neighbor in Room 203 Disappeared Leaving their Keys Behind.(Comic Version)"
Thank you very much
Is there a manga in here titled as The Neighbor in Room 203? I don’t exactly know the title but there was a sentence in the cover which is “The Neighbor in Room 203 disappeared, leaving behind a bunch of keys.”