Some of the song lyrics say (He found love at this school Which is the first love, although it is not long, but it is the love that he remembers in MY STORY . Which VVS = Very Very small could be interpreted as She is as beautiful as a diamond with the slightest flaw. It's a gem in this school.)
1:31 Girl: Why did you send me a message? I'm still studying. Boy: sorry She: Later, send it to me after school. (The scene where she talks when she picks up the phone to show him.)