qiān yuē qián jiù yào wèn qīng chǔ bù yào děng yào zǒu shí cái fā xiàn dài jià hěn gāo

签约前就要问清楚，不要等要走时才发现代价很高。

Ask clearly before signing the contract; don't wait until you're about to leave to find out the cost is high.