After the Empress Ascends, The Villain Dies in Her Arms

Princess Qin Shimyue, misled by a misunderstanding, believes her childhood friend Shen Ping'an has betrayed her and helped his enemy slaughter her family. Upon ascending the throne, she personally executes him. However, an empty coffin and a will uncover a mystery. While investigating, she discovers that Shen Ping'an took the blame and died protecting her, solely to help her secure the throne. The truth breaks her heart.