The male protagonist accidentally traveled through time, and the system told him that he had come to the Beiyuan Kingdom. His identity was the Beiyuan Kingdom's national army. When he was complacent and planned to be a foolish emperor to enjoy himself, he found that he had to listen to the regent in everything. When the regent found out that the male protagonist was not the real emperor, he was forced by the situation to poison the male protagonist in order to control the male protagonist. The story unfolds from this
Concept: Love spans time and space