序幕 (xù mù): Opening scene / Prologue (Noun) — Meaning & Stroke Order

The successful conclusion of this negotiation is merely the prologue to deeper cooperation between the two parties.

Don't you think this conflict is just the opening scene of a greater crisis?

His brilliant speech last night served as the prologue for the entire academic symposium.

This is definitely not the prologue of the story, but rather the prelude to the climax.