It's Modern Japan that refuses to acknowledge it's past war crimes… Imperial Japan seemed to be pretty proud of it.

If you look into the past 2 centuries of China, you'll find that it generally sucked living in China.
Totalitarian government, WW2, Opium, Rebellions, Communism, Droughts, Poverty, Incompetent leaders, Europe, National and Cultural identity crisis, etc.
If you'd ask me what's an example of a country with a bloody history, I'd point at China first.