He is unprofessional but if this is true people forget that this is basically a toxic relationship.
If this was a woman and the other way around, people would drag the guy to the moon but now he is just unprofessional since he is a man. Of course, I would say that he definitely has to apologize to everyone but this is definitely a double standard. Toxic relationships can happen so fast and to almost anyone. He does not look healthy at all in his pictures and behavior. I am not even a fan of him or have watched anything with him, the reaction is just very shocking. I know some friends who have been in toxic relationships but people literally laughed at them when they confessed their problems since they should be “manly” or the dominant one in the relationship.
Nevertheless, he made the life of the staff and other actors a living hell and Seo Yeji has to had iljin rumors since 2014.
DISCLAIMER: this is based on the dispatch article and the other posts by staffs - there was no post by him or seo yeji - the thread might be edited or deleted once there is more info