Lucilias

It's about a world full of magic with a power-less MC who has a very porwerful family/siblings
He meets a guy with black hair that's one of the most powerful magicians on Earth
Also MC was stillborn and reincarnated by his mom and is cursed I think

It was a shounen ai about a magical world where things like automativ doors can only be open with magic. There is a dude with black hair who meets a dude with light hair (blond or pink, i don't remember)
The eyes of the characters are very importanr and particular, I think black hair has black eyes, and light hair and his siblings have yellow and blue eye (or one blue/yellow and the other black)
And light haired cannot use magic at all (like he can't open the automatic doors) though he's coming from a family of very powerful individuals, especially his siblings who are like the chosen ones.He is considered a failure by his family and has low self-esteem
Tbe black haired guy is also very powerful, coming from a great family and stuff.
We discover at some point that black hair actually have the power and eyes of light hair, as light hair was a stillborn. The mother or a sibling who can manipulate time managed to save him but he's doomed to die at a young age. Black hair decides to give his eyes back.
There's also a story about light hair's ex gf who was kind of a witch and ended up cursing him because he wanted to have magic and to fit in his family and believed it could help him.
The story is pretty sad but the artstyle very pretty ! I hope someone recognise this