Huayu: The Big Players Behind the Scenes

A heads-up: (This is a single female lead, Lao Liu, focusing on behind-the-scenes work. There aren't any exaggerated scenes of surprised bystanders; it's more in line with the era.)
I didn't have any extraordinary luck. How did I end up being reborn at the age of 18?
What? He has a transmigrator in his head? He even has a system?
Huh? I didn't touch it, so how did it break?
If that's the case, then I can only thank my time-traveling brothers for the generous gift.