The name of this song is Su Yan, but it doesn't constitute a pure girl's face. The whole lyrics are rainy days, shopping for photos and laughing at others. This means that plain-looking girls don't have to be afraid to get wet in the rainstorm, because they don't wear makeup, so they can't help laughing at other girls with makeup, and they have to go shopping with umbrellas in the rainstorm, because the rain will make their makeup bloom.