One of the reasons I found the heated discussion in the comments to last chapter unnerving is that we had too little info to be choosing a hill to die on, and I trusted Wanan to give us elements to decide whether Haejoon's father, mother, both, or none are to blame for the lack of contact all these years.
I'm not disappointed. This chapter has begun revealing more information. For example, that Haejoon's mother may have been too stubborn about raising Haejoon on her own. Then again, we know her ESP caused social stigma and that may have caused her to be like that (and even been a reason for the divorce?).
Conversely, Gyungho's business card has two pieces of information: one, that by being a lead engineer, he may be the brains Haejoon's taken after; and two, if he's in such a job at this point, are we sure he was in such dire straits all this time to not be able to even try to find his son? I don't know. We'll find out. My judgement remains suspended.
And then, I'll count it a plus to Gyungho that he isn't forcing himself on his son. He's asking for permission for each step he takes to rebuild the ties. He's waiting for reciprocity. I can appreciate that, it's not too different from the uncle. It may turn out that his estrangement was caused by his selfishness or lack of parental concern etc., but I'll remain open to whatever outcome. And even if he was neglectful, that doesn't make him a moral monster like Eunyung's parents, just a man who made a big mistake and might have to regret it the rest of his life.