On the day Shen Qingtang was thrust into Prince An's Mansion to celebrate the wedding, everyone in the capital was laughing that she wouldn't survive more than three months. The prince is sick and weak, the palace is in ruins, and even the servants dare to step on her head. But no one knew that the crying Princess Chongxi held the sharpest knife in her hand. The commander of the Jinyi Guard found out about her. She cried and hid behind the prince. She turned around and had the commander's secret files copied. King Qi held a banquet to test her. She pretended to cough up blood due to choking on wine, and that night there were more secret letters in King Qi's study. Until one day, the sick prince cornered her in a corner, his fingertips brushed the old scar on the side of her neck, and he smiled meaningfully: "Princess's injury looks familiar to me."