I am not referring to the mortal arch. I believe DH is intrigued by FJ since the moment he spies her talking about him to SM . That's why he plays a trick on her at the wedding. And he finds her beautiful. He says so to Lian Song; he says that those who called FJ a beauty had good taste. But when does he fall for her?
I think that he starts to fall in love with her when FJ helps him fight the witch in Aranya's dream. Like he said, it's the first time in his life that someone seeks to protect him, instead of seeing his protection.
What do you think?
What about FJ? She loved him all along, but at first, it was the kind of love a teenager girl has for her idol. When do her feelings become more mature and real?