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She had been planning for so long just to get revenge on her sister who had discriminated, ridiculed and humiliated her; but she had ridiculed and bullied her sister, but she was able to stand up when a stranger was in trouble... The world is always changing, and everything in life is also changing. The only thing we can hold on to is what remains unchanged in our hearts. Such as kindness, regret for the past, true love for sisters...