改過自新 [ㄍㄞˇ ㄍㄨㄛˋ ㄗˋ ㄒㄧㄣ; gai3 guo4 zi4 xin1]
  to reform and start afresh (idiom); to turn over a new leaf
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  改過自新
  かいかじしん
  noun (common) (futsuumeishi)
  changing one's attitude or conduct and making a new start
  turning over a new leaf
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