Yi Shuihan and Feng Xiaoxi have been good friends since childhood, and they secretly developed feelings for each other as they got along.
But the emperor wanted Yi Shuihan to marry his sister. In order to prevent the emperor from getting engaged, Yi Shuihan chose to go to the battlefield and come back to marry Feng Xiaoxi gloriously.
When Yi Shuihan was fighting, Feng Xiaoxi's mother introduced the girl to Feng Xiaoxi according to what Yi Shuihan said before leaving, and asked Feng Xiaoxi to spend her life with her. However, Feng Xiaoxi refused, so she had to make an agreement with Feng Xiaoxi to marry Gu Nanli when Yi Shuihan hadn't come back yet. No regrets.
Just when he was about to return victorious, Yi Shuihan unfortunately died on the battlefield. When he was about to die, Yi Shuihan gave the letter he wrote before the battle to his subordinates and asked them to take it back and give it to Feng Xiaoxi, the eldest young master of the Feng family.
But when Feng Xiaoxi was about to fulfill her promise to get married, she received a letter from Yi Shuihan, which was a huge blow. After she collapsed, she took Yi Shuihan's letter and left the Feng family to live in seclusion in the mountains.
The wind is rustling and the water is cold, and the strong man will never return once he is gone...