Valorant offers more team cooperation and ability usage rather than raw mechanical aim (don't get me wrong though, cracked aim is definitely important). In a country with significantly less populations than major regions like NA or EU, you will statistically have a smaller number of mechanically skilled gamers. Therefore, Koreans rely on other aspects of the game where they excel at, specifically utility usage and team coordination, hence why they are generally worse at games with less mechanical skill such as CSGO and better at more utility and team cooperation ordinated games like LOL and Overwatch.