The name of this person in the drug trafficking organization was known as "Rat".
He was actually Hei Mei's biological brother.
After Hei Mei was kidnapped and sent for training within the organization, a major change occurred at home.
The parents soon both passed away, leaving only him, the brother.
After working for a few years, he found this life too difficult to bear, so he started trafficking drugs with others.
It started with small-scale operations, but he discovered that drugs were unbelievably lucrative.
And thus, he got hooked.
After meeting Mu Qiankun, he followed him in drug trafficking all along.
He used all that money as travel expenses to search all over the country for his long-lost sister.
In the beginning, there was some hope, but the more time passed, the more disappointed he became, and he ultimately gave up on the search.
When Hei Mei was at home, her brother treated her quite well.
