向我心脏开枪死的是你朝你背后捅刀痛的是我
[xiàng wŏ xīn zàng kāi qiāng sĭ de shì nĭ cháo nĭ bèi hòu tŏng dāo tòng de shì wŏ]
This translates to 'If you shoot my heart, you will die; if you stab me in the back, I will feel pain,' which indicates that betrayal (stabbing in the back) by close people hurts much more than direct confrontation (getting shot)