About his identity: He is the grandson of one of the Three Elders. He is also the owner of an assassination guild and has control over several different businesses.
Did they cut the wine-poisoning scene or what? I'm at the start of Episode 4, and they never showed what happened after the end of Episode 3 when Zheng shi saw the woman coming in with the wine. Did I miss something, or are they saving it for a flashback later?
Source: Episodes 1β6.