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One day, I witnessed my son's wife, Rio, cheating on me. She had been married to her son for three years, and even though she had devoted herself to the housework, she was showing signs of roughness, and was often late returning home. Thinking for my son's sake, I questioned Rio and she seemed open-minded and denied cheating. When I got angry and found evidence of infidelity from Rio's smartphone, I felt excited about my son's wife, which I hadn't been aware of until now. And I decided to train this unfaithful wife and convert her into a homely, obedient wife...