A very very very long time ago, FL & ML were lovers. They were together for a long time too.

Then things happen. She got into deep sleep & when she woke up, she became the emperor of heaven's daughter, without a memory of the past.

Now. That 2ndML was tasked to guard a certain device. That device was once ML's belonging. So, after guarding it for a long time, he kinda got affected by ML's aura. That's why FL thought she has a crush on 2ndML, when it's actually just the aura.

Anyway, FL will reincarnate again and again in the mortal world, and every time, she will be together with ML.

Despite the title, he is not the wrong person. He is the right person :)

the FL was indeed too innocent and naive at first, she was the daughter of the emperor heaven, doted, she was like a blank paper unaware of any worldly affair nor the 6 emotions but she thought she had a "crush"on one of the god in heaven who was banished to immortal world so she wants to go down to follow him. Under some trick she was sent with a prophecy book which tells the person who he reincarnated in that world, but it you look at the title you can guess that she would get the wrong person and it'll continue to happened in each world, except it's the same soul but just not her "crush " she fell in love with that same soul and realized her feelings for the "god" was not love. Later the more she travel the more she realized that her main priority was not chasing the love like her innocent self but to broaden her knowledge and to experienced the mortals world. Of course she still got together with the ML since the souls has been bonded too deep