It's so funny that we get to see Zoro's backstory in ep 19 and then Sanji's introduced immediately afterward. Behold, the perfect dichotomy of characters in One Piece; the person with the straightforward backstory that we get in one episode, and the person with a layer [whole] cake of backstory that practically needs an entire arc alone to trace.

Han-seo next to his chosen big brother whom he admires so much