Zhan Moxiao wanted to buy Ou Lan's teeth.
That was because when Ou Lan's grandfather made a marriage arrangement for her and Zhan Juncheng, he insisted that she be allowed to grow up on her original life trajectory. She was not to be disturbed until after she got into university, and it was forbidden to tempt her with money. Therefore, he couldn't lure her with money.
When it was time to exchange teeth, Ou Lan was just a six or seven-year-old child. Zhan Moxiao tempted her with candy.
He lied to her, saying he collected old teeth to make medicine to cure people's illnesses. If she gave him her teeth each time one fell out, he would give her two pieces of candy that were unique in the world each time.
Why two pieces of candy? Because he knew she had a best friend who was so close they could wear the same dress, one for each to eat.
