Assuming that Lujiu gave birth to twins, Ace might have an older sister.
But unlike Ace, An was frail and sickly since childhood.
After all, I think it's amazing that Lujiu's mother has been holding back Ace's health for so long, and I think it's amazing. An is a weak little girl.
Ann knew that there was a brother but Ace didn't because the second brother who delivered him at birth thought Ann might not survive.
But An still managed to persevere, probably because he had a goddess and a father who was the pirate king?
In short, the grown-up An decided to go to sea to find her brother.
It's too unchallenging to find it as soon as you look for it, so just get on the red-haired ship first to ensure your own safety.
It's finished, please feel free to eat.
Purpose: I want Ace to be my older brother