"Your EMS".

When handing the envelope to Li Lechen, Xiao Zhang carefully examined him for a moment, hesitated for a while, and then asked, "How...are you feeling right now...?"

"I'm fine, I just need to rest for a while."

"That's good......."

Li Lechen found it strange. He had been unconscious and unwell a few days ago, so it was normal for a security guard to show concern. But Xiao Zhang's hesitant manner suggested that it was definitely more than just concern.

"Is there something you want to tell me? Just say it."

"It looks like your mom's arguing with someone at the entrance of the apartment complex..."

"What?"

"It's nothing, it's nothing! You should get some rest! It's really nothing! I just brought the package up to you. Your mom didn't do anything. I just bumped into her at the door. She should be back soon."

"???"

Li Lechen was speechless.

However, not wanting to make things difficult for the security guard, he pretended to agree with him, accepted the package, and closed the door.

In the past, if Li Lechen wanted to know what was happening at the entrance of the residential area, he would have had to run there. But now, he only needs to listen carefully.

This ability to distinguish sounds from a distance is not a superpower; it is simply a skill that people will acquire in the near future.

At that time, humans were still in a stage of competing with various highly intelligent animals, but compared to the survival skills inherent in these animals, humans were incredibly weak. We couldn't fly, couldn't swim, suffered from the cold of winter and the heat of summer, had poor eyesight, hearing, and a dull sense of smell—practically at the very bottom of the food chain.

In order to better evade capture, humans began to master some skills that were easy to learn in a short time, such as distinguishing sounds from a distance.