The team is searching for someone who is targeting Asian women. They learn that he is African American but speaks Chinese well. they discover that he was the product of a rape wherein the victim was Asian and the perp is AFrican American. After he is caught his defense is that he was mistreated because he was a reminder to his mother of what happened to her and he was not really accepted in her community. Which strikes a nerve for Olivia who's also the product of a rape. Written by
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I know that if my sister had dated a black man, our parents would've... strongly objected.
So he sets himself up to be rejected not only as a man but as a non-Asian. It's like he's looking for a reason to get angry.