Alpha Wolf: The Big Boss's Woman Is Mine

[Underworld + undercover agent + ruthless and decisive + no beating around the bush + multiple heroines]

The day my big brother pushed me to take the fall, I accepted it.

The day I died in prison, I woke up, but someone else was inside.

The first thing I did after getting out: make my sister-in-law my woman.

The second: swallow up my big brother's territory, one piece at a time...

Of course, to keep myself from being strangled by the throat ten years from now, it wouldn't hurt to make some money in the capital markets and put it toward developing chips, right?