从前有个很好的男人叫蓝颜
[cóng qián yŏu gè hĕn hăo de nán rén jiào lán yán]
The phrase 'Once there was an excellent man called Blue Face' (or Lan Yan, depending on interpretation), uses 'blue face' colloquially as 'a very dear male friend'. It refers to a time when such a wonderful friend or admirer existed nostalgically, highlighting appreciation for significant friendships in one’s history.