你若逢场做戏我就将计就计
[nĭ ruò féng chăng zuò xì wŏ jiù jiāng jì jiù jì]
If you play games, I'll turn the tables on you. It expresses a mindset where if one party acts in an insincere or duplicitous manner, the other will respond in kind, essentially saying 'if you pretend or deceive, I’ll cleverly use your own methods against you'.