It's sad how these situations could usually be settled with an apology. But, nooo the older brother has too much pride to say sorry to the younger brother he had exiled for the pettiest reason.
No idea about the WN or LN, but doing a quick check, it seems it barely adapted 1 LN Volume out of 2, but both the WN and LN haven't been updated in some years, and i don't see the author finishing the WN or LN at this point either