Broken RSS

Hi all, my RSS is broken:
http://hongwrong.com/feed/

I’m not at a level where I can make much sense of the errors, but you can see the results of Feed Validator here: http://feedvalidator.org/check.cgi?url=http%3A%2F%2Fhongwrong.com%2Ffeed%2F

I’ve a feeling it may be related to the use of Chinese characters in one of the recent blog posts.

Any insights would be most appreciated!
Cheers.