Yu Tiannan lay half-dead in the operating room. While in a coma, a bad doctor and sister-in-law removed one of her kidneys...
Yu Tiannan had a dark face and held colorful small stones in his right hand. He asked loudly: "Is it my kidney or this stone that is more important?!"
Sister-in-law: "Of course it's a stone. That stone is your partner."
(Under modification...)
Purpose: You can still live well with only one kidney