Update: Yay! Solved by rhondaleaSay what? According to YT Comments, this is a 3 part series? Part 2 lists Zhao…
I think what you have is Parts 1 and 2 of the first video (your parts 1 and 3, which are from DramaBox as a single video titled "Thorns Beneath the Veil.") Your Part 2 is "The Story of the Woman in the Palace," which has an entry here on MDL.
They each got what they wanted--she holds power in her own right and he holds her love, without the constant threat (and annoyance) of concubines.
He never wanted to be emperor; he just wanted her to love him. And she does.
The chains were overkill, though.
I'm not sure if Part 3 is released yet.