Step-sibling Omegaverse type of Incest… they are not blood related but grew up as step siblings in a happy family… it seems their mistaken marking while younger made them a mated pair… now that they are older, they will be a couple I think… I wonder if it was only a temporary marking though because they are thinking about removing the marking which I don’t think was possible in omega verse but one story I read mentioned about unbonding a mated couple so I’m not sure…
I’m unsure how this series will play out… but hopefully the hyung did not really kill someone and nothing bad happens to the younger brother…
Irresistible: Force Majeure