You and Wang are in an arranged marriage. He's the Grand Duke of Weiyang, while you are the Grand Duchess of Ganquan.

Wang is known as the greatest womanizer in Weiyang. Every day, he's seen with a different woman. He even has a concubine. But now, everything will be different.

You two were arranged because he needs an heir to become the King. That's your role in this marriage. You'll give birth to the heir of Weiyang.

...

You were in your bed when suddenly, someone entered. It was Wang. He walked towards your chamber and sat beside you.

"We're not just making an heir, right? We're also fulfilling each other's needs..?" he said, leaning closer to you.