菇凉世态安凉别太善良
[gū liáng shì tài ān liáng bié tài shàn liáng]
This phrase combines a playful use of the word 'girl' ('GuNiang') and advises not being overly kind. Translated more freely, it says something like: 'Girl, keep safe in this world of cold reality; do not be too good-natured.'