Even though I might find it myself later... Please help me find the novel that has this description from the beginning segment, I vaguely recall... So the MC shou definitely gets transported to this game? With horror elements and his first level partner was supposed to show him around but I think his eyes are not working or he is blind or injured so instead of grabbing his fellow player he grabs onto the big boss while everyone else runs off or disappears for a while then it is like sweet fluffy feelings I think as he breezes through the game because of the boss... setting was like medieval castle or something and I can't remember if ML was a Demon Lord type of thing or a vampire or a ghost my mind is drawing a blank... Anyways please and thank you for your time and help.
Falling In Love in an Escape Game https://www.novelupdates.com/series/falling-in-love-in-an-escape-game/ I think it's this