According to Netease Cloud Music, the original song "Angel's Wings" written, composed and sung by Xu Yuteng was released on May 10, 2065438, and included in the album "Lillian and Han Meimei" of "LiLeiandHanMeiMei".
Angel's Wings Lyrics: Where will the fallen leaves go with the wind, leaving only the beautiful sky and flying figure, like angel's wings, across my happy past.