Well I'm overreacting that they hate him lol but they don't pay him to much attention as a character (his own character).
I can't speak alot on the novel because I remember like 10% but Joseph doesn't show up much of the duration of the novel, I think Wilford show up more😅 also I don't think Joseph even showed up at the end of the main story only side story. But honestly felt like he was made in the novel and forgotten😕

For the manhwa, after S1, Joseph has only shown up to cause confliction in the romance aspect. Never something of his own accord. If he shows up its to cause a love triangle reaction only and it's always (95% of the time) before or after erez is around. Basically only to use Joseph as a catalyst for the romance in the story.

Also to give the "I loved you in different lifetimes" only to make him 2nd ML is sickening😤 honestly if they didn't give that I would've been fine if he was 2nd ML🤣

But, yea, the reason I say they hate him is because they only use him romance wise and not plot wise. They only see potential and after put him back in the hiatus section until he's needs to cause another romance on confliction.

OHH I almost forgot mention this, they keep making him have (light) negative emotions (ex. Jealousy or inferior), I mean he's human, he's gonna have a more human reaction whether its ugly or not, but antis will always say some bullshit around it and twist his character.

And one thing I'm really not looking forward at the possibility, is that they will make him have a huge horrible reaction to finding out erez is a demon. This will cause a huge ass fight in fandom if it does happen. And once again him having a human reaction will make people twist shit.

So I basically don't like how they write in that he's the only one (ML wise) having those negative emotions. Not sure how the authors is trying show it but it FEELS like they are making one look better than the other when both are equal fine.

I asked my moot💜, who has better memory than me, about novel and she said Joseph basically a side character😭 but she's glad he has more screentime in the manhwa, tho for me I think I would've prefer he stayed as a side character rather than 2nd ML😤 if your gonna give him more screentime make it platonic not romantic and ruin the mood of him not being the one. S1 really drawed us in with him then drop him🥲