IT IS NOT SLOW. Yes it takes like 100 chapters for them to hug. Which might seem like it's a lot but after the "training" arc it's like 2 month into the story and he was away from the city where she was for more than a month on requests but I'll get to that later. And she usually gets like 2-3 sentences per her appearance so not a lot of screentime for the FMC. Right from their first meeting she was staring at him fascinated because of the Robe he got from the fairy king or whatever that was then she helps him find some books then they spar once and then he leaves for 10 days (reminder that she is supposed to be like 200 years old seasoned veteran adventurer who broke an arm of some noble she is training because he tried to r*pe her) and she IS GRUMPY and behaves in such a way that everyone in the castle she is staying in immediately notices her weird behaviour. Even she is saying to herself how she misses him. After literally meeting him 3 times. When he is coming back in 10 days... Then they eat curry. Yes because when you use the trope of getting transported/reincarnated to a completely different world that's what you do if you are Japanese. You eat curry/rice take a lot of baths and use honorifics. This is obviously not something specific to this novel but yeah. And while eating curry she notices that he is really enjoying the meal so that means he is awesome and they are close to each other. Then he buys a house and she is halfway living there. Then another request this time for 40 days. She finds out that he had to go to a different city in the kingdom (royal capital) on the way back because of reasons so she jumps on the captain of the knights so that she can go there. After they know each other (the MC) for 2 months. Because this 200 y.o. highschool teenager can't stand it if she can't see him right this instant. Then they meet there and she hugs him in front of everyone like it is the obvious thing to do as if he was her long lost lover she hasn't seen for centuries. Then they meet another elf. This time 2000 years old. And she is completely smitten by him (more or less). In an instant. Because of the robe. And another male elf thinks the MC somehow charmed the uber old elf and tries to beat the MC and get's beaten instead by the main female character. I hate myself for reading it and even more for even bothering to write this review. TLDR of the romance he is a plank of wood and she behaves like a brain-damaged 13y.o. fan of a pop idol. About his enemies. There are none. So far he met a few "beings" that he could not kill. A Dragon king in the early chapters that wasn't hostile. A griffon that wasn't hostile. A kraken he was fighting under water. And one demon thingy that he fought twice and hasn't really lost. That demon thingy was able to literally demolish a Hero character of the different world who is supposed to kill the Demon king and the demon thingy said that the MC is 10000x stronger than the Hero. Everyone else be it allies or enemies are so far beneath the MC it's not even worth mentioning them. His allies constantly say things like "we can't antagonize him ever otherwise we are gone." Or he can make this country disappear in an instant hopefully he won't defect to another country.

an example is MC checking Abel's pulse. You don't check the pulse at nape. You check it at the front of the neck midway between the jaw and the collarbone. Another is him stopping the bleeding by stopping the flow of blood in the artery. What happens there is that not only will the wound not close due to him stopping blood flow but also result to the death of a limb due to the absence of oxygen from the absence of blood.

he lived alone for 20 years without talking to anyone and even though he met the dullahan, a certain amount of time has passed way before that. How was he still sane afterall that?