Ye Yunqing was a member of the Night Owl assassin organization, a master of both medicine and poison.
When the laboratory exploded, one of her teammates shoved her into the flames as she evacuated. She was reduced to ashes along with the lab.
When she opened her eyes again, she was wearing a bright red wedding dress and sitting inside a bridal sedan.
A flood of unfamiliar memories came rushing in. Only then did she realize she had transmigrated...
Her predecessor had been set up by her stepmother and forced to marry in place of her stepsister, only to die on the way to the wedding.
The man she was to marry was the Prince of Zhenbei of the Great Yu dynasty, the youngest noble prince of another surname, who was... gravely poisoned and under house arrest...
At the beginning of the story, all she wanted was to survive in this strange, ruthless feudal dynasty...
By the end, he stood before her, gazing at her with deep, unwavering affection...
"Qingqing, I wish to walk by your side, hand in hand, until our hair turns white, in this life and every life to come. I will never leave you."
Ye Qingqing: "...Wait, aren't you supposed to be the big brother? How are you still such a lovesick fool?"
[The male lead is the type to fall for her through his own assumptions]