你若毁我今生我定废你未来
[nĭ ruò huĭ wŏ jīn shēng wŏ dìng fèi nĭ wèi lái]
Translating closely, it means 'If you ruin my life now, I'll destroy your future'. It suggests a strong and resolute character willing to take revenge against whoever causes significant harm to them.