Source Han Sans and Source Han Serif are modern, open-source, pan-CJK typefaces developed by Adobe Systems and Google. These fonts have large capabilities to cover commonly used Chinese, Japanese and Korean texts. And they're good alternatives to the WenQuanYi Zen Hei and AR PL UMing fonts.
Do not use region-specific subset version of the fonts.
See:
https://github.com/adobe-fonts/source-han-sans/raw/release/SourceHanSansReadMe.pdf
https://github.com/adobe-fonts/source-han-serif/raw/release/SourceHanSerifReadMe.pdf