Is the serum only effective on him? It shouldn't be like that. David lowered his gaze and pondered for a moment. When he raised his gaze again, he had already arrived in front of a room door.

"Go in." The leading man glanced at David and coldly said to the young man. The young man's eyes lit up upon hearing this, and before entering the room, he intentionally glanced at David a few more times.

There were many rooms here, and it seemed that the entire building had been turned into their base. The room in front of them was Room 303. "Hey, you two, come with me," the leading man said coldly.

He glanced at the little black dog that had been following them all the way and impatiently asked, "Is this the dog you brought back?"

historical

"What's the use of this thing? Isn't it just for stewing and eating at the critical moment?" The leading man spoke and saw the little black dog snarl in discontent, prompting him to sneer.

He muttered, "Quite spirited." The man turned around and continued to lead the way.

The little black dog quickened its pace and walked up to David, rubbing against him with its furry body. It let out a low whine. David reached out and patted it, whispering, "It's okay, little black, we'll endure a bit longer, and we'll make you happy later." The little black dog seemed to understand David's words, wagging its tail happily.

The group continued walking forward until they finally stopped at Room 309. The leader turned around and said, "I don't know why the boss chose you, but from now on, you can only listen to us here. You'll stay here, and once you collect twenty crystals, you'll get your guns."

As he spoke, the man proudly swung the gun in his hand. "See this? I collected thirty crystals for this. You'll make do with twenty! Now scram!" With that, the man snorted and walked away.

"David, what do we do now?" Arnold asked as he saw the man completely leave their sight. David remained silent, and a few more men appeared in their line of sight.

The men glared at them and then entered Room 308. The entire building had an unknown number of people and firepower. Engaging them head-on might lead to victory, but they would also sustain injuries. It would be better to make use of other means...

With that in mind, David turned around and opened the door to Room 309. As the door opened, a foul stench filled the air. "Th-those are zombies?" Arnold looked at the bodies lying in the room and spoke slowly.

David furrowed his brow. In the center of the room, there were two zombie corpses. What was horrifying was that the decaying flesh on these corpses had been dug out, leaving only a few rotten pieces of meat clinging to the bones, barely holding on.

David walked inside and closed the door. The two of them squatted beside the zombie corpses. The marks on the corpses didn't resemble bite marks; they looked more like they had been cut off with a blade. Could it be that these people here were eating zombie flesh?

However, David quickly dismissed the thought from his mind. In the previous world, even supernatural beings turned into zombies after eating zombie flesh, let alone ordinary people. What were these people doing with the rotten flesh of zombies?

[Task: Doomsday Reserves! ]

[The doomsday is approaching. Please collect as many usable resources as possible and store them in the reserve space! During this task, all the resources you store will receive a 100,000 times critical boost. Remaining time for the task: 0 days, 5 hours, 0 minutes.]

After an hour had passed, the system issued a warning sound. David stood up and walked towards the door. He couldn't waste any more time here; there were still many machines waiting for him to collect.

Arnold saw David leave and hurriedly followed suit. Room 303 was not arranged like Room 309. The interior of Room 309 was furnished for normal human living, while Room 303 only had a bed, a chair, and a small cabinet. Compared to the other rooms, Room 303 was the smallest, barely the size of a bedroom.

The young man sat on the only chair, holding the hand of the girl on the bed. He trembled and said, "Darling, it seems like we have a chance to escape."

On the bed, the girl's hands and feet were bound by chains. Tears slowly streamed down from the corners of her eyes, her gaze vacant as she stared at the ceiling.

Suddenly, the girl spoke, "I... I don't have the strength anymore."

Upon hearing these words, the young man trembled all over, his hands holding the girl's hands shaking. "No, you can still survive!"

The young man stood up in excitement, and the chair fell to the ground. He gasped heavily, his chest rising and falling. The next moment, his expression calmed down, transforming into a face filled with apology. "I'm sorry, I forgot. You don't like it when I act like this,"

he quickly said as he helped the girl up from the fallen chair. When the young man held her hand, a faint green light shimmered in the palm of the girl's hand. This power slowly flowed into the young man's body, unconsciously healing the injuries within him.

"David, over here," Arnold stood in front of Room 201's door and waved to David.

David walked over to Room 201. The two of them looked inside through the window. Many people were sleeping in the room, and within this room, numerous boxes of military equipment were stacked. There were about ten boxes in total! David's eyes lit up.

He squatted beside the little black dog, patting its head gently and saying, "Little Black, it's up to you now. Do you understand what I mean?" As he finished speaking, he pointed towards the door of Room 201.

The little black dog jumped happily, and as it walked towards the door, David and Arnold took cover in a nearby location. In the next moment, a burst of flame spewed out from the little black dog's mouth! Instantly, the door of Room 201 was charred, and even the person leaning against the door was engulfed in flames.

"Ah! Fire! Fire!" The people in Room 201 shouted.

David stood aside and quickly beckoned to the little black dog. The little black dog looked dissatisfied but still walked over to David. Once the commotion started here, the zombies outside would immediately come over. They needed to act fast, take away these military supplies, and then rescue the young man and his girlfriend. Today's task would be completed. After the two of them and the dog found a safe spot, footsteps could be heard in the stairwell.

"Hurry up! Move everything out from inside!" the man who was leading earlier shouted. The surrounding comrades watched as the fire grew larger, and none of them dared to move forward. The man scolded and kicked two men inside directly!