She is an unpopular single-parent emperor. He is the favorite nephew of the Emperor of Heaven.
When the old secrets faded away, she seemed to have forgotten the past and just wanted to live a peaceful life. He seems to have never cared about family feuds and hatred, and is satisfied with everything the Emperor of Heaven has given him.
One night, the two made an agreement that only the two of them knew about.
"You help me bring down the Queen of Heaven's power, and you will be the Queen of Heaven from now on."
"I still need ten thousand years to cultivate to the first level."
"Okay."
"I, please pay homage to the Emperor of Heaven."