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This answer was totally beyond Song Weiyi's expectations.
Her interactions with Sheng Zhenguo were limited, but she knew that he placed great trust in Lao Wang and would instruct him to handle almost everything.
"What's so impossible about that? There's a saying that fits well, 'You can know someone's face but not their heart.' The more sincere they seem, the more mischief they're plotting."
It wasn't just Song Weiyi who hadn't anticipated this, even Pei Yibai hadn't thought it would be this person at the beginning.
Or perhaps, Lao Wang had never intended for Sheng Zhenguo to die, otherwise, he wouldn't have used those simple drugs.
It was only because Fu Qishan was like a godsend that Lao Wang's scheme was advanced earlier than planned, leading to Sheng Zhenguo's death.
Fearing that someone might discover something, Sheng Zhenguo's affairs were almost all personally handled by Lao Wang, and even Sheng Jinsen hadn't interceded.