I’m kind of confused; did Dojin give Yulha a fake imprint? But why?

I think what he meant is that he didn’t imprint strong enough to make it permanent. Apparently Blondie is a dominant alpha which could allow him to override Dojin’s imprint. It seems like he’s waiting for it to wear off to try to make a permanent imprint. What a scumbag. He’s literally just using Yul to get one over on Dojin because he’s bitter that he was more popular and successful when they were in school together. He doesn’t give a single fuck about Yul’s feeling, safety, or autonomy