Siyan traveled through time and became the evil queen Su Mutang. As soon as she woke up, she was questioned by the emperor's boss He Yu about the poisoning of the imperial concubine and was thrown into the cold palace. While in the cold palace, the regent Si Xingyi came and expressed his suspicion that she had been wronged and would investigate. It was eventually discovered that it was the imperial concubine who framed her.
After Siyan cleared her grievances and returned to the palace, she met the palace maid who was being hunted and learned that the imperial concubine had colluded with the rebels to plot rebellion. The matter was exposed, and the imperial concubine was brought to justice. But Siyan received another mysterious letter and was told that the danger was not over yet.
Siyan was found to be chronically poisoned. With the help of Si Xingyi, she investigated the mysterious organization and set up a trap to capture the leader Shadow. When the relationship between the two was heating up, there was an emergency at the border, and Si Heyu went on a personal expedition.
The war was not going well, so Siyan went to the border to make plans to turn the tide of the war. The leader of the barbarian tribe negotiated for peace but wanted to cede the city. Siyan firmly refused and proposed trade, and finally a peace agreement was reached.
After the war, Si Heyu announced that he would only love Siyan and implement monogamy. After returning to the palace, they lived happily. Siyan participated in palace affairs, and reformed and governed the country with Si Heyu. Everyone also performed their duties, and their story became a favorite.
