C580 Grand ending

Zhang Jin thought to himself, "These people must be holding my dad hostage. How could there be any flower or grass poison? There definitely isn't any antidote. My dad must have lied to them. I have to think of a way to defeat them in one fell swoop."

Thus, Zhang Jin went into his room, sneakily took out a medicine bottle, and walked out.

Alright, the medicine you're looking for is in my hands