I Transmigrated to the Ming Dynasty and Became Zhu Biao’s Godfather

A smart protagonist, one heroine, and no System. Does transmigrating make you invincible? Special forces soldiers get a System when they transmigrate, but I’m just a college student who can’t even fight my way out of a paper bag. I’ve got nothing, and now I’m supposed to fight two other people? Isn’t that asking for my life? At least I have a big brother. I’ll just eat, drink, and cheer him on. Big bro, take me to the top! Other transmigrators build planes and cannons. I don’t know how to do any of that, so I can only tinker with small inventions. Who knew the guy I’d be fighting later would be a total cheater?