Dungeon? This Tree? Why Don't You Join Me for Lunch? (Dungeon Core)

(This is a dungeon core story!) Sylvan is a nymph. A nymph who had lived his entire life protected by a barrier. Hiding the fact that his tree was a dungeon. But now, someone took off the barrier! Tourists are besieging his tree, cutting off branches to use as presents! He has only one option left before him: he must use the mind-altering mushrooms which he grows near his dungeon tree to stop people from chopping his tree down! And it just so happens that he knows how to cook with a flare! Follow him as he feeds those who want to cut off his tree, brainwashes them, and finally levels up his dungeon. This was not a romance story... but then the kind vampire appeared, and the MC lost his heart.