That's because they have a cultural value system similar to ours. Honor, duty, morality, family, honesty, self-sacrifice, hard work...these are all values our culture shares. That and their generally high intelligence are major contributing factors to why people from Japan, South Korea, Taiwan, and Hong Kong (before the ChiComs completely fucked their development) are typically able to assimilate and fit in to Western societies. It is why they're the only non-Whites I would accept as immigrants to the US: cultural compatibility.