Substitute Couple

[Both characters are virgins + cunning + fast-paced + no internal conflict + satisfying read + no angst]

The Xie and Lu families, two pitiful, invisible individuals, are arranging marriages for their unreliable older siblings. Lu Xuan doesn't care who he marries; if it were Xie Miao, it would be quite interesting.

Xie Miao, it doesn't matter who she marries. If that person is Lu Xuan, she'll be happy.

You can have any kind of brain, but you absolutely cannot have a love-struck brain. When you get married and live your life, think less about love and not love.