冷心疯子暖心医生
[lĕng xīn fēng zi nuăn xīn yī shēng]
'Cold-hearted lunatic warm-hearted doctor'. It seems like this pseudonym describes contrasts: an apparently heartless individual who's secretly compassionate or someone with dual personalities; possibly referring to characters in dramas where coldhearted protagonists turn out having tender sides, or just highlighting the differences inside and outside one’s image or personality.