The correct reading はんせい uses the on'yomi for both 反 (han) and 省 (sei). It means to reflect on one's past actions, consider mistakes, and commit to improvement. Incorrect readings like ばんせい or ぱんせい mispronounce 反, and はんぜい mispronounces 省.
正しい読みは「はんせい」で、両方音読みです。自分の言動を振り返り、改善すべき点を考えることです。ばんせい、ぱんせいは「反」の誤読、はんぜいは「省」の誤読です。
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