After the End, it's shown that he's now trying to mend the broken relationship with his father while awaiting for the recovery of his mother, deciding to take it slowly and continue to train under Sol. When Valentine attempts to self-destruct the gate to the Backyard, Sin is forced outside the gate by Sol. He is eventually beaten out of his condition by Sol, and continues to fight Valentine's Justice form. The brainwashing fuels his desire to surpass his master, and increases his rage towards Ky. This trait ends up getting him kidnapped and brainwashed by Valentine to serve her. Since he was raised under Sol (and no thanks to his surprisingly young age), Sin is very hotheaded and charges into things without a second thought. Because of his very fast growth rate, he was placed in Sol's care for the discovery of his existence will endanger his life. All of the attention was given to him by his mother, Dizzy. Ky gave him very little, if any, attention, making their relationship very distant. Sin deeply resents and hates his father for not being there for him after he was crowned King of Illyria. Sol is more of a father figure to him than anyone else, even his biological father, Ky. He travels with Sol due to his Gear nature, which makes him an easy outcast. Sol's student and the illegitimate son of Ky Kiske and Dizzy. 'Of course! My heart always has, and always will be, open to all!'

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