What is the name of Yung Sister's music beauty male and female imitation voices singing

"Dear where are you", "the past can only recall", "fifteen moon" and so on. Yung Sister Er Music is a singing netizen with 54,000 fans on watermelon video. She features a song that can be sung in both male and female voices separately, and she sings them all in rhyme, making them sound very, very comfortable.