I was so agitated when he called their whole relationship as a rape and kissed him to make him feel better. What do you expect from a person who himself hate his existence as a ghost to tell his partner that his very good existence as a ghost is changing him into an omega.
Even yeehyeon said that if he found out the whole things earlier he'd have run away but he knew that liu and their relationship is not some trash or a rape that's why he never let him go
They were official at that moment and was planning to move in NY but because the whole things revealed by a third person made Yeehyeon felt betrayed and at that time he was 50% omega so he called himself a monster in front of liu. Both were in so much pain but thankfully they trusted their love for each other and took time heal each other wound. After a year they met again in Paris and then got married
https://sites.google.com/view/dd-dark-mode
You can read it here
end of chapter 11/beginning of chapter 12
https://sites.google.com/view/dd-dark-mode/dd-all-chapters/11-the-scent-is-a-drug?authuser=0

Got spoilers from the novel.............he is a yellow flag at best