1, I won't sleep if the moon doesn't sleep. My sister thinks Brothers in Tears is a song sung by Yin Bao and Feng Xinyang. It's called "I won't sleep if the moon doesn't sleep".
2. Lyrics excerpt: I won't sleep if the moon doesn't sleep. The elder sister wants the younger brother to cry. She once said that she would stay with me forever, but those vows have been invalidated.