After I Transmigrated as a Cannon Fodder, I Decided to Steal My Sect's Secret Manual

At long last, you transmigrate into a wuxia game, all ready to take the cheat-enabled route, only to be told you're a cannon-fodder character?

Your sect is doomed to fall, your junior sister will turn into a villain, and all you can do is steal the sect's secret manual, grab your junior sister, and run for it with a bucket in tow. Then hand her over to the imperial court in exchange for a comfortable life of wealth and idleness.

The crisis threatening the world? Leave that to the original protagonist. Cannon fodder should know their place. There's nothing wrong with lying flat.

Wait, why is the plot getting more and more different from the original...?