People in Meteor Street don't believe in love. So do knights. But when he found himself doing things for her that he wouldn't do again and again, he realized the seriousness of the matter.
She is just cannon fodder who came from time travel. She doesn't want to change the future plot, but the love is so deep that she can only eradicate it.
So, she ran away and he chased her. When she discovered the butterfly effect that she could not avoid, she faced her feelings: Come on, I am not afraid!
Then - the flowers on Moshang have bloomed, you can return home slowly.