百毒不侵无药可救
[băi dú bù qīn wú yào kĕ jiù]
The user describes themselves as immune to all poisons ('Baodu buqin') which metaphorically suggests a strong emotional guard, and also believes there's no medicine to cure this attitude ('Wuyao kesou'). This may refer to someone who feels unaffected by others' negativity or love.