A swordtail guppy, four or five centimeters long, with colorful dorsal and tail fins featuring blue-black circular spots resembling peacock tail feathers. Originally purchased from a bird and flower market for ten yuan. Old Cheng brought it home to live in a luxury tank with mountain spring water and top-tier delicacies. The fish is nearing death and is open-minded about it. It reveals itself as the Substitute for the Beloved—a token of love between Old Cheng and his first love. The fish calls Old Lady Cheng Sister-in-law, considering itself an elder since three years for a fish equals a lifetime for humans.
