好心着雷劈 [－－－－－]

Jyutping hou2 sam1 zoek6 leoi4 pek3
Pinyin hǎo xīn zhe léi pī

Definitions (CC-CANTO)
  1. Kindheartedness may not meet with good recompense.
Definitions (粵典–words.hk)
  1. 語句
    俾人恩將​仇報
    be good to someone but got treated badly in return; literally, "kindheartedness struck by lightning"