Why do they think they have Yan Zeng when we know he didn’t go back? And why did the prime ministers wife say…
Because every household needs to provide one man to go to war (or give money if there are no men left probs), so in order to protect CY, in the novel, either XZ or Gongsun Yin got Yan Zheng "registered" in the list of names
Not hard to do actually, considering he is literally the Marquis, but I think it was a bit confusing in the episode
I stumbled upon a wild blade of grass in a lonely wilderness. She was incredibly resilient—the stronger the wind blew and the harder the rain fell, the more wildly she grew. I adored her, yet I could not dig her up and take her away, nor could I turn her into a greenhouse plant to be arranged at anyone’s whim.
A wild blade of grass is only at its most vibrant, most dazzling, and most unrestrained when it grows upon the fields that belong to it.
She is wonderful. Nothing can confine her—not fate, not her past, not even me.
2 
I found a playlist on YouTube but it's not official: https://www.youtube.com/playlist?list=PLaGIwfASz8pPIqTqGuICTyEVt8EO2rb9S
Full List of Songs + short excerpts of each song:
https://weibo.com/7967655953/5273101735560848
Not hard to do actually, considering he is literally the Marquis, but I think it was a bit confusing in the episode
I stumbled upon a wild blade of grass in a lonely wilderness. She was incredibly resilient—the stronger the wind blew and the harder the rain fell, the more wildly she grew. I adored her, yet I could not dig her up and take her away, nor could I turn her into a greenhouse plant to be arranged at anyone’s whim.
A wild blade of grass is only at its most vibrant, most dazzling, and most unrestrained when it grows upon the fields that belong to it.
She is wonderful. Nothing can confine her—not fate, not her past, not even me.