"You don't mean what you say (DJheap Nine-day Edition)".
According to Kuwo music information, Drinking and Singing Alone comes from the song "Insincere Words (DJheap Jiutian Version)", Lyricist: Yue Yong, Composer: Qin Feiqiong, Arranger and Producer: DJheap Jiutian, Producer: Xu Liang.
Part of the lyrics: Even if I don’t have you by my side in the future, I can find reasons to be happy alone. I can sing and drink alone, hug myself and cry alone. Even if there is no such thing in the future. When you were by my side and loved me, I could find an outlet for my sadness alone. I found someone to sing to, someone to drink with, a shoulder to lean on, and my tears wet his pillow. It lasted forever at that time.