When you're passing by Heyu Tea House and have to squeeze your way through the biggest crowd you've seen in your life, that's when you know Yunjin's on stage performing. There's not a merchant in Liyue who wouldn't buy up the place if they had the chance, and Yunjin is the reason it would be worth every Mora.
When Yunjin drinks a beverage she is fond of, she will be inspired to write a new play. So, I keep a jar of tea leaves under my bed at all times, ready to deliver to her on the day that her inspiration dries up. This way, I shall never run out of heroic tales to listen to!