I love the Asian culture and was happy when I saw this episode, which I believe is their first one, focusing on the Asian community.
But, sadly, this episode has already been done. In Season 3 episode 'Neither Rain nor Sleet' we saw a Latino man kill his sister, and this is the exact same thing that has happen with this episode, a minority killing a sibling.
The Agents had many suspects in this episode since the victim was a frequent guest of online dating services, and there was also her ex fiancee who she had a horrible fight with at their pre-wedding celebration, but he turned out to be gay.
Another part of this episode that irked me was the location of her body after the brother confessed to killing her.....where was it, they left us hanging on this on.