The Rise of Phoenixes c-drama summary:
ep 1 - 68 :
MC : I will do anything for you, I'll die for you , go against the Emperor , anything you want.
ep 69 - 70:
She: You killed my husband
Mc : Let's sleep together
She: Your father killed my mom & brother
Mc: Le's forget the past, let's sleep together
Mc in last ep: Oh ! she suicide because I was a jerk ! Never mind, I killed my brothers and became the emperor !

From ep 1 to ep 68, mc is all about "Protect the weak, punish the criminal" and "I don't want people to sacrifice their lives just so I can sit on Iron Throne"
and after becoming emperor mc be like: "don't care about that dancer girl or her sisters who died for me" , "Xing Zi Yan ! who cares! let him die"

No regrets for killing a woman's innocent husband, just wants to sleep.