Su Wan, an orphan from the previous dynasty, was trained by the current Queen Mother to be the sharpest knife. She was sent to the side of the powerful Prime Minister Song Yan to act as his ideal "virtuous wife" and collect evidence of his rebellion.
Song Yan, a young prime minister, appeared to be loyal and patriotic, but in fact he was an underground king who overthrew the imperial power. He already knew her identity, but he kept her by his side, happily playing a dangerous taming game.
During the day, they are a model couple who work together to solve the problem; late at night, they are accomplices who share a secret.
When her blade touched his throat, his kiss fell on her forehead.
"Madam," he chuckled, with a look of madness in his eyes, "can you add one item to your to-do list -"
"Stay with me till you grow old."
