This article is about people who immigrate from one East Asian country to another. Despite looking the same and having similar cultural values, they are still often marginalized in their host countries.
There are also groups of people who were colonized but not completely "integrated" into their colonizers' culture.
Japan
Attack on Titan - Isayama Hajime
Do you ever think that maybe a wildly popular anime and manga series about a race that possesses superpowers, gets confined onto an island after losing a war, and has a man lead a rebellion against the country's self-imposed disarmament to commit genocide on the mainland isn't making progress towards East Asian peace and understanding?
I do not feel informed enough to comment on this. Complex intersection between Chinese colonialism, Japanese colonialism, United States occupation, etc. etc.