SNOW HYENAS.
Those were the first monsters that attacked Yejun as soon as he entered the Special-Grade Crack alone.
And those types of monsters were usually found at low-grade dungeons.
Hence, he could tell right away that those monsters didn't belong there originally.
However, Yejun also noticed that the snow hyenas there were unnaturally bigger and stronger than the normal ones.
It was as if those snow hyenas were raised in an unnatural environment.
Hence, he kept one dead snow hyena in his Inventory.
[I'll give it to Semi Noona later.]
After Yejun killed roughly around two hundred snow hyenas every day, he soon met the big bosses in that dungeon– the wyverns.
Wyverns were smaller and less powerful than the 'true dragons' that he fought before.