Odo finds out where he came from, and he's not happy about it. Sisko finds out what's happening next, and he's not happy about it. And we meet the Founders of the Dominion, and nobody's happy about it. The DS9 Rewatch engages in "The Search, Part II."
Kira is incredibly supportive of Odo at first, thrilled that he’s found his people, but as the episode wears on she becomes more and more disillusioned, not aided by the not-even-a-little veiled contempt the female changeling shows toward “solids” in general and her in particular. (This will come up again when we next see the female changeling in “Heart of Stone” and several more times in the Dominion War arc of the final two seasons.)