to answer your questions:
1 they are not blood related they are brothers because their parents got married and the duke adopted her.
2 the ring acknoledge her because she wrote the novel so she know the name of the blue fire sipirit that resides on the ring and protect the head of the family, and like she know the name the ring wont hurt her.
3 Yustaf is the male lead
ok in a way it is incest, but they are not related ,only by name and they never interacted like siblings because her mother harrased Yustaf, and Ran avoided been near him. So i dont know, i dont think these is incest perse ╮(￣▽￣)╭
Aaaah thanks (づ￣ ³￣)づ
So, so they do be related? (つ .• _ʖ •.)つ
So whos the ML(;´༎ٹ༎`)