We're Still Babies, So How Is Ninth Brother Already Invincible?

Lin Bai transmigrated into the body of an abandoned baby in the cold palace, while his younger brother was born with a sword physique and was the Immortal Sect’s holy son? And the System got the wrong guy, too! I’m in a fantasy world, and you give me a martial arts System? Wait, even the tiniest effort from me pushes the System to its limit! Can’t beat the eighth prince? Then I’ll pick on the twenty-second! I’ll fleece Mother Consort, trip the guards, and level up as the palace’s little tyrant! Three years later, immortals descended on the court, oppressing the imperial family and demanding boys and girls as offerings. Watching his beautiful mother being humiliated, three-year-old Lin Bai flew into a rage. “You old geezer! Take this punch!” The emperor was dumbstruck, the consort wet herself, and the whole continent was stunned. So this is what kind of kid you are?