Undercover Boss: Cleaning Up My Act Starts with Winning Over the Sister-in-Law

[Undercover in the underworld + ruthless and decisive + extraordinary fighting skills + sharp-witted]

The good news: Underworld boss Song Yanqiu died unexpectedly…

He left behind a beautiful sister-in-law, a fortune, and a gang of ruthless underlings…

The bad news: Why do I look exactly like the boss…

Superior: Congratulations! Starting today, you are Song Yanqiu. The villa, the fortune, the beauties, they're all yours.

Heh heh heh… Then I won't stand on ceremony.