In the early years of the Republic of China, the current situation was turbulent. The Shen family in Jiangnan was accused of "collaborating with the enemy" overnight, and the whole family was executed. Only the young Shen Zhiwei was brought back to the house by the passing Northland warlord Gu Laoshuai, adopted as an adopted daughter, and renamed "Gu Wei". She kept her name anonymous and worked every step of the way in Gu's house. While trying to please Mr. Gu and gain his trust, she secretly investigated the truth of the year.
At the age of seventeen, Gu Yanting, son of Marshal Gu, returned from abroad and served as young marshal. He noticed the alienation and vigilance in "Gu Wei's" eyes, and became interested in this nominal "sister". In the trials and confrontations between the two, they both had the throbbing of youth and were full of suspicion due to their conflicting identities and positions - Shen Zhiwei suspected that Gu Yanting was involved in old family cases, while Gu Yanting discovered that she seemed to be hiding something.
Su Manqing had a deep love for Gu Yanting. Seeing that he was different from Shen Zhiwei, she repeatedly framed him. At a banquet, she deliberately revealed Shen Zhiwei's "Jiangnan accent", which aroused Gu Laoshuai's suspicion. In order to prove his innocence, Shen Zhiwei was forced to cooperate with Gu Yanting, but in the process he discovered that he was unaware of what happened back then and was even dissatisfied with his father's methods.
As the investigation deepened, Shen Zhiwei found his brother Shen Jinghong and learned that the Shen family was silenced because they had evidence of Gu Laoshuai's collusion with the Japanese army. The brother and sister planned revenge, but unexpectedly Gu Yanting had secretly found out part of the truth...
