Back then, he simply believed that the best love letter a man could give a woman was a marriage certificate. Of noble birth, while Gu Lanshan was an adopted daughter purchased by the Gu Family, his direct proposal to marry her, facing the opposition of the Sheng Family, would undoubtedly have met with 100% rejection. Therefore, when he learned of Madam Gu and Wang Jiayi's plan, an idea struck him, and he decided to use their scheme to his advantage, enacting that scene of "catching adulterers in bed."
He also knew Madam Gu's love for money was paramount, so he tempted her with an enormous offer to have Gu Lanshan married to him, ultimately getting his way.
He just felt that he could give her a better life, that he would treat her many times better than Madam Gu ever did.
Yet, what he never anticipated were the deep seeds of bitterness and the lasting impact his actions would have on her heart.