He hated her to the core - because of her, he transformed from a young minister of Dali Temple into a white cat trapped on the windowsill of the sixth floor, struggling to survive in the sewers, and wandering in a strange world for three full years.
She felt ashamed of him all her life - because her temporary kindness was used in the wrong way, causing the white cat to jump into the dirty sewer, where her life and death were unknown. She felt guilty for this for year after year until she was bitten to death by the white cat.
A life for a life, no debt to the other.