After her parents died in a car accident when she was five years old, Audrey has been raised by the Holmeses and spent that time with the future detective.
Sherlock: Audrey, go read my article about the identification of 24 famous perfumes...
Audrey: Don't even think about giving me perfume again this year! I don't have to!
--------------------------------------------------
The ending is HE, the male protagonist is obvious
The heroine has traveled through the world. She knows Sherlock Holmes but is not familiar with the plot. Her IQ is not low but of course she is not as good as the two brothers. She has reasoning skills for low IQs and sweet pets.
Ps. The author will never accept Shen Xia Li's BLcp, so please don't comment on Fuhua/Huafu/Fumo/Mailei, etc.
Ps. Ps. The author, a science student, has poor writing skills on British history and geography. I guess he has to rely on his mother-in-law and research on Dang Shen.