得便宜卖乖
dé​pián​yi​mài​guāi

to act like a victim after profiting

  1. 得 dé verb
    to get
    to obtain; to receive; to gain
  2. 便宜 pián​yi nounverb
    small advantages
    small advantages; benefits that one should not have gotten
  3. 卖乖 賣乖 mài​guāi
    to act hard done by
    To pretend to be aggrieved or to have suffered a loss even after receiving a clear benefit; often used in the phrase 得了便宜还卖乖 dé​le​pián​yi​hái​mài​guāi