To be honest, Lu Bei had never actually met Hu Er in person. The only time they had experienced a moment of "motherly kindness and filial piety," Hu Er had been wearing Lin Buyan’s skin, warning her godson that the waters of the Tribulation Crossing Stage were deep and he wouldn't be able to handle it.
The reason he guessed the sender was his godmother as soon as he received the secret letter was that he recognized a scent he had smelled on the five little foxes.
It was a unique pheromone—distinct from the usual perfumes and powders, carrying a hint of seduction and a sense of being both near and far. To the opposite sex, a whiff was refreshing; to the same sex, it was disorienting. It was a secret formula known only to vixen spirits, and since each one was different, it functioned like a personal business card.
Chapter 427