I read this manwha months ago. It was about a female lead who got reincarnated in a fantasy world. Then somehow ended up moving to a palace. The female lead remembers that she reincarnated in a comedy genre novel but she noticed some strange things in the palace like it was haunted.
The title hinted that it changed from comedy to horror genre.
Second one coming to mind is How to Survive as a Maid in a Horror Game
“Don’t disappoint me, Hilda.” 「Adrian’s murderous intent is rising.」 「Convince Adrian to lower his murderous intent. If you fail to do so, you will die.」 「Adrian’s murderous intent: 92%」 Adrian Kaiser von der Pfaltzgraff. The successor to the Pfaltzgraff Family. He is praised as an angel by the entire world, but only I knew the truth. That all the serial murders and attempted murders, which have been causing a fuss in this region as of late, have all been the actions of that amicable looking young master. No, I was the only one who could know this. Since I was the only one who entered into this ridiculous horror game world. Someone save me, please!
This one also has the haunted (?) palace part + comedic elements, but it might honestly be too new of a manhwa
Both of my suggestions are honestly pretty far off but might as well try. First one coming to mind is Trapped with The Male Lead in a Horror Game.
I became a maid in a horror game. Trapped in the mansion, I either penalize the protagonist trying to escape or act as a guide. "I'll lock you up too if I manage to get out." The protagonist is too loud. So, I decided to help him escape quickly. "Let's have some food, Dietrich." "It's a potion. It'll help you recover quickly when applied." "The escape's hint is right here..." I fed him well for the next playthrough, gave him potions to use if he got injured quickly for the next playthrough, and blatantly gave him hints for the problem. We can go out now, right? By the way. "Well, I'm not sure of the answer." What's with this guy who's supposed to be smart? ...The protagonist just doesn't seem to want to leave the mansion. "If you don't leave, I'll leave." Feeling annoyed at the thought of having to keep seeing that despicable guy, I shouted in frustration. "Were you even able to leave from here?" His eyes narrowed sharply. "I'll tell you, I have no intention of leaving here." "What?" "And you can't leave either." What on earth is going on here?
Got the haunted palace part but doesn't rlly have any comedic elements
Might you be thinking of Silent Lady?
A child who has the ability to see ghosts, Yoon Seol-woo. Has reincarnated into Rosantine, a princess who could see ghosts.
It has a protagonist in a fantasy world who reincarnated into a person in a palace which is haunted, and the title is a bit creepy in its implications. Not matching, I haven't found any reference to the protagonist being aware that she's in a novel.
