When the spring wind blows one by one, when the summer cicadas sing one by one, when the autumn leaves fall one by one, when the winter snow falls one by one. Who knows how I will live tomorrow if I am no longer mine. Sadness is my solo song, death is the only song that suits me. Decline and decline, happiness passes, melancholy is the song of a lifetime. Living alone, I can only leave and turn into a clear song. Confused eyes, unbearable loneliness, it doesn't matter, I will sing a song for you forever, the song you and I love most about going back to the past. But, I don't know what I can do if I go back to the past...