Their initial plan was to find Dong Heng in the dance hall, take advantage of the hall's unique environment to approach him, and then Yin Yin Yin would deliver a fatal blow with precision, while Le Yu would be at the door to assist them in escaping after the assassination. It could be summed up as 'killing a person every ten steps, leaving no trace for a thousand miles'.
Yes, it's that simple.
No fancy poisoning, schemes, deceit, or murders in secret chambers; the assassination plan was straightforwardly 'committing murder in the street'.
They find the target, kill them, and flee—what more is there to say?
