Lin Xuan's physique is "causal balance". He can grant others supreme opportunities, but he must also take away equivalent "things" from the other party - it may be a hundred years of life, a memory, or a "fate" with a close relative. He is the most generous giver and the most ruthless taker. When he had to take away "all the memories" of his best friend in order to save him, Lin Xuan experienced for the first time the immeasurable pain caused by "balance" when he looked at the other person's unfamiliar eyes.
