The Nie Family and the Li Family once had dealings, but those were during Grandpa Li Yanzi's generation!
With Grandpa's passing, the relationship between the Nie Family and the Li Family had already faded.
Especially after Grandpa died and the Li Family, headless like a group of dragons, gradually declined while the Nie Family remained in its heyday, the interactions became even scarcer.
Nie Yuan agreeing to Li Mou's request to treat his mother was completely unreasonable.
Especially since Li Mou is now so intimate with some woman outside, he's probably not at all eager for his mother to wake up.
Under all these circumstances, the answer to why this was happening seemed imminent.
The reason was simple, probably because Li Mou had his financial freedom restricted by her, and after being instigated by that woman, he wanted to regain control of the Li Family's financial power.
But the financial power of the Li Family had been entrusted to Li Yanzi by Grandpa on his deathbed.