Kang Oh prioritized one task over the others.

He would raise his proficiency in Demonic Swordsmanship until it wouldn't go up anymore. In other words, he would reach the 'wall' that Burkan referred to as soon as possible. 

'It'd be nice if my ring gave me a spontaneous quest for Demonic Swordsmanship.'

Kunta's Golden Talent Ring!

This ring occasionally triggered spontaneous quests that yielded a huge increase in proficiency. If it gave him a Demonic Swordsmanship quest, then it'd make his life a lot easier.

However, he wasn't overly reliant on it, as he didn't know when it'd activate, and which skill it'd activate for.

Ultimately, Kang Oh had to invest a ton of time and effort to increase Demonic Swordsmanship to its max.

Thus, Kang Oh slept only four hours a day. Aside from his time spent eating, he spent his time going through all of the hardest difficulty dungeons he knew of.

This included the ??? Dungeon, the Saul Graveyard, and the Garden of Death. Basilisks, Chaos Knights and high-rank undead, and carnivorous plants over level 500 spawned in these three dungeons. 

Kang Oh frequented these three dungeons, as well as some other dungeons in the Goddess's Land. Plus, he occasionally went through the Volcanic Region's...