Responses

I think we all kinda want an actual dad to be the ml, but yk Korean standard! Never an actual father is the ml! The children are mostly always of their older sibling's who were be the heir but is dead for some reason! & on cases where ml are the actual father, the fl is to be "villainess stepmother" who used to abuse before. But now the reincarnator feels sorry for them & becomes "real family"
I can 100% guarantee that Leo is 200% that older sister & crown prince's spawn. Ml did not do the tango yet!
Source? Multiple different manhwas with the same plot & also that line that Leo looks a lot like his sister in chap 20/21 is enough to sus that!