Ok it's a really cool premise I will say.
But if you are expecting an epic time travel saga or even something remotely similar to Re:Zero, look elsewhere.
My main gripe with this manghuawa (idk) is that it takes SOO long for the plot to actually move forward. Minor antagonists appear for 1-2 chapters and are never seen from again. Her investigation into the downfall of her family in the future makes minor progress every 20ish chapters, while most of the time our MC is flashing her beauty and intellect to the world. All of the boys her age love her and of course that includes her brothers. There are also random fantasy elements in the air that do things and interact with the MC (????).
To better summarize how slow the story feels:
First ~10 chapters: She is born -> 3 years Old
Chapter 11 to 87: She is 5 years old
I will say it was an interesting writing choice to keep the female protagonist at a young age instead of doing the timeskip thing to make her 16. I just find it problematic that she is universally known as a cute genius and adults actually take what she says seriously (remember, 5-year old). Although, the MC roasting adults and befriending other children is a pleasure to read.
Read up to chapter 87, don't feel like trying to find it on another website.
7/10