Poisoned Tea at the Birthday Banquet

The head of the Hu family, Hu Zonghan, suddenly collapses at his birthday banquet, and all the evidence points to the second branch. Second Young Master Hu Mingrui has three days to find the culprit, or his branch will be expelled from the ancestral hall. But the real culprit is the third branch, which deliberately framed them to set the two branches against each other.