But I still wonder what has happened to him to have made him like this (hadn't read the Egytian myth but maybe I should
I kinda read all the season and is pretty messed up, you feel sorry for seth and kinda hate all the others specially osiris and isis.
here you can read the raws: https://tkor.wiki/%EC%97%94%EB%84%A4%EC%95%84%EB%93%9C-ENNEAD
Seriously I can't believe that this story is still using "omg I have feelings for my friend's crush what should I do" as a serious conflict. They are not even dating. And if you really feel bad for your friend you should at least be open with your feelings. There's something wrong both with the plot and the character development, the story is just flat and boring.
THEY. ARE. ADORABLE. And people please with kind with Hyesung as well -- it's obvious from his expressions and actions in this chapter to see that his love and devotion to Seungchan is genuine. Even though they have been through things, Hyesung was trying to deal with his past and to be better for Seungchan's sake as well.
And the author clearly puts in effort to build realistic characters (instead of stereotypical ones) so that the development of their relationship feels real. Also I love how the author pay attention to small details: like the director takes off his ear studs during work but puts them on after work! And you can see the piercing on his ears!!