One Piece fanfic + [Theme: Development] + [Character: Devil Mentor] + [Style: Master-Disciple Bond]
The first thing Joseph, the former king of killers, did in time travel was to take away the genius girl Kuina who should not have fallen in front of Zoro and Koushiro.
"Gender is not your prison, your vision is."
On Drum Island, when Kuina was moved by Siruluk's death, Joseph taught her the most profound lesson with his actions.
He came to the castle, suppressed the tyrant with one move, and played with the fate of the entire country in the palm of his hand.
He turned around and said to Kuina: "Look, the end point of swordsmanship is not to cut through steel, but to cut through invisible things like 'destiny'. Today, I will teach you the first lesson - how to cut off a person's 'death date'."
Many years later, when Kuina put the tip of her sword in front of Hawkeye Mihawk's throat, she whispered: "My teacher taught me that nothing in the world can be cut without interruption."