In a segment of tranquil and beautiful music, the camera slowly pulls back from a poster on the window advertising wall featuring a certain pop star wearing one earplug (a noise-isolating earplug). It turns out that this photo is for an earplug advertisement, and the music is the lead single from the singer's latest album. Beside the window, Xiaoming is gazing with his big, watery eyes, leaning on the window frame, lost in thought as he looks at the outside world. The scene fades out. The first act ends. ..................