For what I read, let’s say he really is the ML (I didn’t like him, he was a wimp that was used), but actually there is no ml, she ends up with no one since she is like a supreme existence or something like that. She is just there to fight injustice.
You can look for the novel and spoilers for more accurate info since I didn’t really bother reading it, but so far that’s what I got. So dropping, this was boring, she’s kinda deus ex machina, there is no real conflict because she just resolves everything as goes because she has magic that allows her to do about anything.
http://novelfull.com/ghost-emperor-wild-wife-dandy-eldest-miss.html
Read this if you like novels...

SPOILER
I've started reading the novel and apparently, the king (Vincent) shown at the end of chapter 3 isn't the ML. There is literally a chapter titled "Ch 6 : The end of the First Love" in which he expresses how he can never be with her because people already hate the royals for what they have done to her and he turned into a wimp either way and his character is boring to be honest. I was surprised and a little disappointed that it wasn't him but seeing how uninteresting he is, it's better this way