"Then that settles it!"
Nagato nodded slightly. "That's Yan for you! He's sincerely working for the people of the small nations. He loves peace just like Yahiko, but he's smarter than Yahiko.
"And it's already been agreed that, as long as the Land of Rain consents, the canal can be used after the war to benefit the civilians of all four countries, and it can also channel the Land of Rain's rainwater into the sea.
"Zetsu, we'll still need Yan's abilities after peace comes. Whatever intelligence he wants, help him find it."
Black Zetsu felt utterly aggrieved. What does peace have to do with me? I just want to rescue my mother. I use peace to deceive you, and you use peace as an excuse. You bunch of bastards.
However aggrieved he felt, Black Zetsu dared not show it. This was the Rinnegan. If Nagato really sealed him, what could he do then? That would be the end of everything.
Full of grievances, Black Zetsu found Uchiha Yan fishing on the eastern coast of the Land of Rivers.
The moment he saw Uchiha Yan, Black Zetsu couldn't help complaining:
"Brat! Didn't you say you were dying? How come you're still alive?"
"Oh!"
At the sight of his visitor, Uchiha Yan excitedly tossed aside his fishing rod, his face beaming:
"Senior Zetsu! What brings you here? It's been so long. I've really missed you.
"Come, come, I have a bottle of good liquor here. Let's drink and talk.
"I'm telling you, when I saw you in the Land of Rain last time, I knew you were extraordinary. Those resolute, world-weary eyes must have seen so much.
"If you'd talk with me, I'm sure I'd learn a great deal. A junior like me needs experience like yours most of all."
Black Zetsu