Yun Che looked to the far distance; then his gaze became deep and profound: “There are only two ultimate goals that a man pursues; one is to conquer the world, the other is to conquer women. To conquer the world is to reach a new height in life, but to conquer women, is to embellish the scenery of life. If one isn’t able to conquer the women that he wants, even if he conquered the entire world, he would still be at a lonely summit, and experience loneliness everywhere. Yuanba, don’t you think that what I, your brother-in-law just said is right?”
That's right, that's the MC bragging to his brother-in-law the reasoning for courting more women than just one wife.