Feng Yun is the male lead in a Mary Sue novel. One day, he suddenly awakens and realizes that this world isn't quite the way he thought it was. For example, those people who all seem to lose their minds the moment they lay eyes on Shen Qingcheng. What's even scarier is that he's one of them.
A minister steps forward: "Your Majesty, there is an old saying that whoever wins this woman wins the world. Your Majesty should put the greater good first and take Lady Shen as your empress!"
Feng Yun stares in shock: Are you kidding me?
To avoid being forced to name an empress, Feng Yun decides to...
Have his covert guards follow her, keep tabs on the leaders of every nation, and then... take them all out in one fell swoop.
In the end, Feng Yun discovers that he has united the world, while the woman chosen by fate has become the Great Yan Empire's first female chancellor.
Feng Yun: I guess this does count as "winning the world by winning Lady Shen," in a way.
Shen Qingcheng, the Chosen One and a transmigrator: Interesting. You caught all my fish, so why don't you...
Feng Yun: Don't come any closer! Someone, hurry and send Chancellor Shen portraits of eligible men from the various noble families!
The male lead has no romantic pairing. He's a native of this world, and the transmigrated woman is his subordinate. Their relationship is more or less that of friends.
Theme: Though the protagonist is deeply constrained by his surroundings, he keeps learning and improving, unites the world, and ushers in a golden age.