Reborn in a Cage: From Dark Lord to Model Apprentice

- Timeline: After Grindelwald was defeated by Dumbledore in 1945, he was not imprisoned in Nurmengard. Instead, he was reborn with his memories, back in 1926, when Tom Marvolo Riddle was at his most isolated and vicious in the orphanage.

- Main plot, raising him: After being reborn, Grindelwald abandons his extreme belief in "the greater good." Haunted by regret for the past and his fixation on Dumbledore, he secretly finds Tom at the orphanage and takes him away as his "magic tutor." He raises him in a completely different way, suppressing his dark desires and teaching him that "power is meant to protect, not to take." He hopes to turn this "seed of the Dark Lord" into someone gentle and controllable.

- Secondary pairing: After being reborn, Grindelwald keeps track of Dumbledore's movements. The two go from "enemies" to testing each other, and then to a secret reconciliation. Their relationship runs throughout the story of Tom's upbringing, serving as an underlying thread that drives the plot.