
First of all they are step siblings and not related by blood at all.. and the current ran is the author the OG ran is dead so after the accident ran only meet yustaf once or twice before sending him to boarding school so they really didn't grow up together.. and based on yustaf personality I don't think he sees ran as his sister or anything..
Secondly it obvious that yustaf is the ML based on the cover and I mtl in wiki page about character description ┑( ̄Д  ̄)┍ so who else MC going to ended up with other than ML?!
Tbh I don't think of them as step siblings anymore because the current ran isn't the OG ran and that make them more like a stranger as they didn't grow up together
Opinions how how people are shipping them? I'm curious what people think compared to me. (not that imma tell you cause then one side is gonna get pissed off at me)