Even as drunk as Shang Qinghua is, it doesn't seem like a good idea to tell Shen Yuan that Liu Qingge is in love with him. For one thing, it's kind of like spoilers. That's, like, a plot element. Shang Qinghua can't just reveal it in some noncanonical sidequest. So he fully intends to drop that topic, but he's curious. "What was the prophecy?"