The Legend of Korra, Season 4

Bolin:
So here's something I've always been curious about. Who's Lin's dad?

[Lin shoots Bolin an extremely dirty look]

Toph:
He was a guy named Kanto. Nice man but it didn't really work out between us.

Bolin:
And...Okay.

Toph:
Lin, I can feel your enraged breathing from here. Just say what you have to say, and let's get it over with.

Lin:
Just get it over with? Yeah, let's not linger on the fact that I grew up without a Dad. No need to get all touchy-feely about it. Just one of those things, right?

Toph:
Hey, I forgave you for all your garbage a long time ago, and Su and I worked things out. You're the only one who wants to hold on to this family drama nonsense for the rest of your life.

Lin:
Forgave me for what? And not knowing my Dad is nonsense to you? It was pretty important to me. And until now, you would never even discuss it. You know, after Su and I patched things up, I thought "Maybe I should try to reach out to Mom." But now that we're together again, I remember why we stopped talking. You make me furious, and you don't even know why. And when I tell you, you don't care. Once we save Su, you and I are finished.

Toph:
[sighs sadly] If that's your decision and it makes you happy, then fine.