Without stating outright to Uncle Qing, the 'plan' Sai Wei was referring to was his uncle's role in the elimination of Renniang's mother Jin Meiji in Ep 24 (1995), albeit with the help of Sai Wei's mother.
First sight of Renniang back in Singapore and back at Sai Qilin's Katong home, after his business trip to Japan with Mingzhu where Xiaodan last spotted them in Thailand in Ep 25 (1995).
It was noticeable in the background when Uncle Qing was speaking to Sai Qilin's wife Yuehao about trying to help out Renniang, Mingzhu, and Guoli's construction company in a loan that there is a photo frame of Yuehao and Sai Wu together, after Sai Wu had said previously after his wife caused a ruckus at the jewellery exhibition that he is the most useless in the family.