An alternate-history setting. An extra-sweet romance with a younger man. "Big Sister, I will protect you for the rest of your life."
Xu Anning, who carries a secret about her parentage, dreams of traveling across the mountains and rivers of Qingzhou. But on her first trip away from home at eighteen, she unexpectedly brings home a child with a birthmark covering his face, so fearsome he looks like a monster.
Xu Anning, who only wants to live a carefree life, originally hopes to raise an outstanding bodyguard. She gives him a name, helps remove his birthmark, teaches him martial arts, and takes him traveling through the martial world.
But because of the female protagonist's "halo," she is forced to get caught up in schemes and political intrigue. If there is no one left in this world she can trust, he alone will stand between her and every open and hidden attack.
"Big Sister, I will protect you for the rest of your life, so you can live however you please."
Theme: In life, you will always meet someone who will chase after you through every twist and turn, and who wishes to protect you for the rest of your life.
