According to the query of Cool Dog Music, I know, sister, I am waiting for you. The original song was Cai Jiting and Red Rose, released on March 3 1, and included in the album "Sister, I am waiting for you", with Cai Jixiang as the lyricist and Cai Jiting as the arranger.
Part of the lyrics goes like this: How lonely I am in the distance, sister, take care. When my brother comes back to talk to me, think about his tears.