Solo Leveling, Vol. 4 (manga)

With a veritable army at his command, Jinwoo is now ready to take on the Demon's Castle-but he's got a meeting with Jinah's teacher to deal with first! When asked to talk down a high school student from a life of being a hunter, Jinwoo figures the fastest way would be to show them the realities of a raid. Little does he know that there's more to this particular gate than meets the eye...