Sooo, I know it’s been a hot topic about how people find it uncomfortable or like to cry “incest” about Hari x Eugene, but honestly look at the facts.
Hari is not biologically related to Eugene, so there’s no way it could be incest.
Hari grew up together with Eugene for less than 3yrs (second timeline) while she grew up living alongside Johannes for 6yrs.
Johannes is cool and all, but if anyone is more of a brother to Hari it would actually be him. Hari also refers to Johan as “brother Johan.” Childhood relationships grow and evolve, it’s not surprising at all that Hari and Eugene, who are not related by blood and grew up separately but still care for each other, would see that relationship evolve into something else.
It was also hinted in the very beginning Eugene had feelings for Hari with him staring at her in her wedding dress mutely and forgoing tradition to have Cabel give her away at her wedding rather than himself.
Personally Hari calling Eugene brother is the most uncomfortable part of this all. I hope she drops that when she realizes her true feelings towards him.