Chu Yu's father died in the battle, and her seriously injured brother revealed to her that the matter was not simple, and she vowed to find out the truth. The Wei family suffered a disastrous defeat in a battle, and only their youngest son, Wei Yun, survived. Chu Yu married into the Wei family and launched an investigation as the widow of her deceased eldest brother. Wei Yun was wary at first, but was moved by Chu Yu during their subsequent interactions. Chu Yu and Wei Yun experienced life and death several times during this process, and their feelings gradually grew. They have gone through the test of life and death, jointly resisted foreign enemies, investigated the truth in depth, and worked together to protect the great mountains and rivers.
