没心没肺的菇凉
[méi xīn méi fèi de gū liáng]
'Heartless Mushroom Girl/Girl With No Emotions.' The use of 'mushroom girl' could imply youthfulness/naiveness combined with emotional detachment. This suggests someone who acts carelessly or happily without considering the feelings of others, either genuinely unbothered or putting up a front of nonchalance.