Decent manhwa, though every chapter feels super short as it hardly progresses in plot. Even till 21 chapters, he hasn't gotten really gotten himself out of the porter status and become a proper hunter, and this means that 20+ chapters were used to basically introduce his skills pretty much one at a time. Peeking at the raws seem to suggest that he finally gets some 'acknowledgement' at chapter 28 - I have a feeling that's where the introduction to Hanyeol ends and get to see how the plot really progresses, meaning it can either turn to trash or become even better depending on how upcoming arcs are done.
Level up alone is similar to the typical korean dungeon-based stuff, where exploration of dungeon is done and MC gets more powa-bunga-unga. The current differences for Level up alone compared to other korean dungeon-based titles are MC's lacking a Revenge background and being an overall decent guy.