I'm the Burdensome Little Sister of a Heartthrob in Troubled Times

Li Qingtang was born in the imperial harem. When she was six, her mother, Consort Dowager Song, could no longer bear the humiliation and hanged herself. Li Qingtang was a princess in name, but the daughter of a traitor in truth. She lived in fear in the harem of Li Chu, where everyone forced a false peace, praying day and night that someone would come and take her away. When she was seventeen, that person arrived, and Chang'an fell. Qin Zhao was born to a wretched fate, with a rebellious streak. He was disloyal, unjust, unkind, and unfilial. He joined the bandits in rebellion and dared to kill anyone. He was the greatest warrior in the land, and the greatest bandit of all. But no one had ever treated him the way Li Qingtang did. She gave him food despite being hungry herself, and mended his clothes despite her hands being cold. At the time, Qin Zhao was covered in sores, his hair was matted, and he hadn't eaten in five days. He looked like a stinking pile of filth, tossed aside in disgust. Qin Zhao swore then that he would marry no one but the girl from beneath Linggan Temple. He often tried to find out where she was, but never succeeded. Little did he know that she was a princess, living deep within the palace... The heavens must have had mercy on him. The day Chang'an fell, Qin Zhao caught her in the midst of a raging storm. The male lead is a bandit in a time of chaos, with a negative morality score, a barely human creature of the turbulent age. He has none of the virtues of loyalty, filial piety, benevolence, righteousness, propriety, wisdom, or trustworthiness. He falls in love with the female lead at first sight, takes her by force at their second meeting, and marries her at their third. The female lead doesn't love him during the early and middle parts of the story, and uses him purely for her own ends. The male lead's greatest good fortune is meeting the female lead; the female lead's many misfortunes are because of the male lead. He grovels for her love, and both leads are sexually inexperienced. Theme: How could sparrows understand the ambitions of a swan?