我姓孙却损不了你
[wŏ xìng sūn què sŭn bù le nĭ]
This phrase means 'my surname is Sun, but I can never harm/injure/criticize/tear you down' indicating the speaker may possess the will but lacks capability, alternatively it might be used self-mockingly. 'Sun' also refers to offspring which is another interesting play on the word.