Actually, it was his goal to have the only girl he longed for and dreamed of all this time. He wasn't sure to be able (and deserve) to marry her in the first place but it happened! In a weird and nasty way, but still. At first, he at least wanted to give his oath to Maxi because he wouldn't be allowed to ask for her hand (lowbirth, half-breed, being a knight and not a noble, inferiority complex, etc.) If he would want to divorce, he would clearly be out of his mind!
Maxi felt her mood plummet. Her stomach turned as she imagined Riftan surrounded by refined, brilliantly dressed noble ladies in the ballroom of the royal palace. And basking in their admiring gaze, Riftan would begin to regret marrying her. He would realize his mistake in not divorcing her…
Fantasy · Suji Kim
Yay! Riftan, finally coming back to Maxi!
Maxi looked up with a jolt to see a giant of a man glowering at her from the door. She had not heard him enter.
Fantasy · Suji Kim
Not a stand-alone book but you can read it in Riftan's POV at the end of Book 1. I was able to read it on Ridibooks (official and original Korean version) thanks to the approximate translation of Papago app.
Maxi felt her mood plummet. Her stomach turned as she imagined Riftan surrounded by refined, brilliantly dressed noble ladies in the ballroom of the royal palace. And basking in their admiring gaze, Riftan would begin to regret marrying her. He would realize his mistake in not divorcing her…
Under the Oak Tree
Fantasy · Suji Kim