First of all, Suisui is the daughter of that President Gu, but he had never heard of any connection between Chi Yu and President Gu. If he were to assume that Suisui was Chi Yu's child right away, wouldn't he be asserting Chi Yu's relationship with President Gu?
Moreover, just when he was about to be certain, Suisui personally said that Chi Yu wasn't her dad, overturning all of Lin Shi's suspicions.
Combined with Chi Yu's phone call revealing he has a child...
Lin Shi scratched his chin, faced with a difficult problem; the thought could be deduced from known facts, or from the conclusions back to the conditions.
It is known that Chi Yu and President Gu's relationship is not shallow.
It is known that Chi Yu is close to President Gu's daughter.
It is known that Chi Yu has a daughter.
The result could be that Chi Yu, President Gu, and Suisui are a family of three.
If using the conclusion to infer the conditions—
Suisui says she doesn't have a dad.
