Lu Han disagreed because their family's daughter did not accept relationships with younger men.
Sun Qing had no other choice; as a result, when Lu Tang grew up, she liked Brother Tongtong, even though her time with Brother Tongtong wasn't long.
However, no matter what Brother Tongtong wanted to do, she insisted on staying by his side, to wander the world together and benefit the people.
Sun Qing gave birth several months after Tang Su in the workshop, and as the baby was born with loud cries, the nurse told her it was a son.
Sun Qing regretted that Tang Su's daughter was truly beautiful. If only Lu Han had agreed, then her son would have had a bride as soon as he was born.
As for Bai Dingxian, he was more open-minded, "If he really agreed, our marriage would be considered incestuous, which is not allowed, you know?"
Reminded by Bai Dingxian, Sun Qing then realized they were indeed related within three generations.