Xi Chen and Lin Youyue broke up.
She goes to that teahouse every day, sits by the window, and orders a cup of Pu'er, which Lin Youyue likes to drink. Looking at the wind chime at the door, waiting for someone who doesn't know whether he will come.
The sun set over and over again, the tea was refilled over and over again, the wind chimes rang over and over again, and she waited over and over again.
Then she became ill and hallucinations came. A person who looks exactly like Lin Youyue walks out of the mirror. He can kiss her, hug her, and tell her what she wants to hear.
Purpose: cherish the present moment