Su Wan, a 23-year-old flower shop owner, accidentally found a bloody letter from the Republic of China in an old book. The letter is written in vigorous handwriting, revealing the smoke of war and endless longing. It is actually the last letter written by Lu Jingran, a scholar of the Republic of China, to his lost lover! Su Wan replied casually, but she didn't expect the letter to be answered in the air. As the petals fell, a strange relationship spanning nearly a hundred years began. She and the talented man Lu Jingran in the letter, one living in modern prosperity and the other trapped in the troubled times of the Republic of China, rely on the letters to communicate with each other, and their emotions gradually heat up as the flowers bloom and fade. However, when she thought she would be his only salvation, she was shocked to realize that Lu Jingran's "dead wife" did not die, but was forced by her family to marry away from home! In modern times, can she reverse the tragedy of the Republic of China and save this estranged love? Or are you willing to be a passer-by in his life and reunite him with his old love? For whom do the flowers on the letter bloom, and for whom will they be thanked?