I Marry the Female Emperor. Why Does My Sister-in-Law Regret It?

Jiang Han transmigrates to a cultivation world and joins a declining clan. When he marries Huo Yao, a genius from an influential family, the sisters switch places, and he is sent Huo Wu, the useless older sister, instead. He thought his family's rise was hopeless, but when he first met Huo Wu, Jiang Han suddenly felt ravenous! Jiang Han: I must just be hungry. Whatever, I'll deal with that first. After their wedding, Jiang Han and Huo Wu experience a bloodline resonance and both rise to greatness. When her older sister regains her talent and her brother-in-law awakens with the potential to become a Great Emperor, her younger sister is filled with regret. Younger sister: I lost a husband destined to become a Great Emperor. I regret it so much! Jiang Han: Thanks, little sister-in-law, for turning me down. You gave me a reborn Empress to be my wife!