The initial premise of selling opium drugs in a historical Chinese setting had me interested, but I can't really recommend this manga after reading all the currently available chapters. The story is unfortunately very simplistic in many aspects.

It is, in essence, a shounen manga with a historical settings when everything suggests it'd be your typical seinen. The characters share multiple tropes of shounens, especially the protagonist, and they don't show any depth in thirty chapters past their initial introduction (which is usually just a short tragic backstory). They don't show any evolution and most disappointingly, the protagonist keeps being frustratingly idiotic at times and makes you wonder what he's doing in this drug business and how he's surviving.

Regarding the second question, it's always through absurd conclusions such as being saved by two persons that manage to shoot down an entire group or blowing up a jail cell to release a person. There's no coherence/realism to it, not in the sense of our reality nor regarding the manga's world. It doesn't follow any short of logic and the explanations are simply not convincing, you get the deus ex machina every time.

Another detail that quite annoyed me is that every girl that is added to the story seems to show romantic interest in the protagonist, which feels dull when it's already the third one (although that was the only real romance, and it was pretty shallow). I thought the initial introduction of the main heroine was pretty cool and there was a nice appeal to the seductive part of her, but the relationship between her and the protagonist is pretty much forgotten.