Because of their innate ability to travel through time, time travelers are passively transported to the world of horror movies.

But he remained completely calm, and even seemed to want to laugh.

This is because before he awakened this talent, he had already transmigrated to the infamous House of Mischief (Beasts) world and even transmigrated into the succubus Chris.

Under the influence of animalistic power, even a mere horror movie became his vacation and leisure travel world.

P.S.: House Guy is a hodgepodge, so there are superpowers, therefore horror movies are not scary for the protagonist.