百毒不侵也是因你绝情
[băi dú bù qīn yĕ shì yīn nĭ jué qíng]
This username conveys a sense of emotional toughness developed because the person was treated heartlessly by someone. 'Immune to all poison', metaphorically speaking, indicates that this person will not be hurt again easily by others, especially due to one particular individual who showed no mercy towards them.