ok so the comic i think was on Tapas.io or Webtoons but pretty sure Tapas. When it first came out there where banners everywhere and promotions for the comic on the main site page back when tapas was a lot newer.
So the plot goes like this.
There two kids a little brother and his big sister. They go into the woods and find a rock and somehow fix it which summons a massive superpowerful genie like creature.
The little brother ask for lazer vision the ability to fly and explode.
the big sister ask for the ability to create anything, then destroy the rock that is anchoring the superpowerful genie to earth, severing it link to earth.
After this there a timeskiip and in the flashback covering the timeskip the little girl basically brought about the apocalpse creating magic, monsters and an rpg system for people to level up, then took over the world and has been ruling it ever since.
back in the post-apocalyptic future a robot girl is trying to fix a food making machine but she doesn't have the necessary part or something and apparently this is happening all over the world.
the only one who can fix these machines is the big sister who is somehow still a little girl and called god by her subject(the world) however her servants keep blocking the robot girl from telling her about the food crisis.
so the robot girl goes on a journey to find the big sisters little brother and finds him a pocket dimension inside a time loop and he is now a teenager despite his older sister being a little girl still.
after free the little brother they join up with the rebel in an airship shortly after an epic battle in the sky between the rebels and the forces of the big sister takes place.
And thats where I last left off.
so if anyone remembers the title and the story I'm talking about please let me know, thank you for your time.