Ye Qiu's lifetime mission isn't the female lead, but the supporting character Ye Yao. The real female lead Ye Xingyan and he don't have any blood relation.
Compared to typical occurrences like his father's illegitimate children that happen in wealthy families, Ye Qiu's elder brother orchestrated an identity swap between his biological daughter and the nanny's daughter.
The reason is quite melodramatic. Ye Qiu's elder sister-in-law Shen Huiran and Ye Yao's adoptive mother Qian Lan Ya were college classmates, but their fates after marriage were worlds apart.
One thought she married into a single-family with Ye Bai, whose family was decent but ordinary in talents, while the other married Zhao Pengfei, the campus star at the time, with promising prospects.
