Are Xingtian and Mia together?

No!

The so-called "together" means that there is a future and hope. But the future and hope are nothing but a joke to drug traffickers.

Xing Tian in "Special Battle Glory" is a vicious drug trafficker, and Mia is his accomplice selected and trained.

The life experiences of these two people are quite rough. Xing Tian was almost sold by Kun Sheng when he was a child. In order to survive, he considered Kun Sheng his "father" and eventually became a drug trafficker.

Mia's father was originally a small boss, but he was betrayed by his subordinates and sold Mia to Kunsheng.

It happened that Xing Tian wanted to select a "capable man", and Mia finally survived after several fights.

Xing Tian does treat Mia differently. While he appreciates Mia, he also hopes that she can choose to leave. Perhaps, in the darkness, he sees his former self in Mia.

But in the end, Mia still chose to stay.

Choosing to stay means selling drugs like Xingtian. Drug selling is illegal and a crime.

If they choose to take such a path, there is no future at all. Therefore, even if they like each other, so what, the ending is a road of no return.