What Happened Between Her and the Male Protagonist in Tan Jianci's Song

[Travel + Reverse Time and Space + Entertainment Circle + Star Chasing + Sadomasochism] Si Qingyue played the song "Eternity Rushing the Sand" and met him, an ancient man who was exactly the same as Tan Jianci. She asked "Are you Kenji?" "No"; "Xiang Liu?" "No"; "Fangfengbei?" "No"; "You shouldn't be Yuan Mo. Are you Gu Yun?" She was a little excited. He shook his head and smiled, "No, my name is Mu Nan. Do you remember it?" He came from the flames of war and died heroically at the end of the war, but his country was already in turmoil. Si Qingyue went against time and space to save him time and time again, but the trajectory of history cannot be changed. If he escapes, he will no longer be him. He walked step by step towards the end of his life. The love and memory for her also disappeared again and again. His farewell letter read, "Please forgive my strange gaze when you loved me the most. Always remember that I have only loved and waited for you in my life."