Everyone learns numbers by separating Korean and Chinese number units, but if you look closely, there are only a few people who truly memorize numbers properly. Therefore, you shouldn't learn numbers by distinguishing between Korean number units and Chinese number units. It is nearly impossible to master them this way. Instead, you should memorize memorable examples (e.g., 한 명, 일 층, 한 달, 한 시간, 일 분) and apply the patterns to other numbers (e.g., 다섯 명, 오 층, 다섯 달, 다섯 시간, 오 분).