Pick up a Young Master as a Backer

He was the eldest son of the First Emperor and the legitimate heir to the throne; she was the daughter of an ordinary admonishing official. When she was fifteen years old, she came to him ignorantly. He resisted the Huns, spoke out and remonstrated, and touched the dragon's scales. However, he was plotted by a traitor and committed suicide with his sword... He once said to her: "There are Fusu in the mountains and Hehua in the sky. Can I call you Hehua?" She nodded with joy and tears. When he rushed to Mengtian's troops in Shangjun, he locked her on the top of a mountain near his residence and said to her through the door: "I am Fusu and you are Hehua, but I am not your lover..." She cried so hard that she fell to the ground and fainted. He left with tears in his eyes, but never looked back. When she woke up, the building was empty. She only thought about what was in her heart. She came to his side again. What she saw was that he was still as handsome as ever, but the warm him in the past had become extremely cold...