Did You Know? I've Been Waiting for You All Along

You know, I'll keep waiting for you, waiting for you to make your choice.

Actually, Dong Qing doesn't know, and Hu Die won't tell him, because Hu Die was set up by Yang Baishu to get close to Dong Qing and entangle herself with him.

It turns out that back then, Yang Baishu spent every night with the famous courtesan Yu Die. Yu Die wasn't merely putting on an act. She loved Yang Baishu, understood his every thought, and would do anything for him. She found her younger sister, Hudie, and trained her, creating opportunities for her. But Hudie truly fell in love with Dong Qing, and Yang Baishu had no hand in what happened afterward.

Dong Qing doesn't know that Hudie will keep waiting for him and loving him. Yang Baishu doesn't know that Yu Die has been waiting for him and loving him all along.