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They certainly don`t feel comfortable in the situation because LIN is the one who ruins other family (two in a row). I don`t think that`s just coincidence because she has been pretty good friend with the poor wife whose husband betrayed her. Also, I don`t agree with your statement,"She doesn`t want to be the "third person." If she does not want to, why she has been the third person TWICE!
I don`t know where you got the thought that "she is such a nice woman." Is it because of her appearance? Then you are fooled.