During his contact with Number One, Xiao Yi was surprised to find that this seemingly ferocious zombie was actually a highly educated Feng Shui master who specialized in physics before becoming a zombie. This discovery made Xiao Yi look at Number One with new eyes, and he began to try to have in-depth communication with Number One.

Although No. 1's language function has degenerated, he seems to be able to understand Xiao Yi's meaning in some way and respond accordingly. Xiao Yi began to teach No. 1 some simple instructions and movements, allowing him to gradually adapt to the human lifestyle.

As time went by, Number One gradually became Xiao Yi's right-hand man. He not only helped Xiao Yi resist the zombies' attacks, but also provided some unexpected advice and help at critical moments. Xiao Yi also began to trust Number One and regarded him as his important partner in this apocalyptic world.

However, Number One has not completely forgotten his past. He often stares at Xiao Yi with his wise eyes, as if searching for something. Xiao Yi knows that Number One must be trying to guess the secret hidden in him.

Sure enough, one night, Number One suddenly spoke. Although his voice was hoarse and low, every word was clear and audible. He told Xiao Yi that he had long been aware of Xiao Yi's hidden secrets. He speculated that Xiao Yi might have a storage space or that he had awakened his supernatural powers earlier than others.

Xiao Yi was shocked by Number One's insight, but he did not deny Number One's guess. He knew that in this apocalyptic world, everyone had their own secrets and trump cards. As Number One was his partner and comrade, he was willing to trust him and face the challenges of the future together.

From then on, the relationship between Xiao Yi and Number One grew closer. They worked hand in hand to resist the zombie invasion and find a way out of the apocalypse. Number One's presence became Xiao Yi's greatest source of comfort and strength in this cruel world.

Xiao Yi knew that it was no easy task to hide Number One's zombie identity among the people in the apocalypse. Although Number One retained human intelligence and consciousness, his body still retained the characteristics of a zombie, the most obvious of which was the unconscious drooling.

Saliva is an instinctive behavior for zombies, but in human society, it is undoubtedly the biggest flaw that exposes one's identity. Xiao Yi began to look for a solution to this problem.

He first tried wrapping No. 1's chin with cloth to absorb the saliva. However, this method did not last long, as the cloth quickly became soaked and easily attracted attention.

So, Xiao Yi began researching medicine. Using the medical equipment and leftover medicines in the RV fortress, he tried to concoct a drug that could suppress the zombies' saliva secretion. After many trials and failures, he finally found an effective formula.

Although this medicine cannot completely eliminate No. 1's drooling, it can significantly reduce the amount of saliva secretion and make it controllable. Xiao Yi carefully gave No. 1 the medicine and carefully observed his reaction.

As time went on, Number One's drooling condition improved significantly. Although there was still a slight drooling occasionally, it was no longer enough to arouse suspicion from others. Xiao Yi also designed a special mask for Number One that could cover some of his facial features while effectively absorbing any remaining saliva.