To ensure the success of Lozen's hunting plan, Gu Qingqiu personally wrote several letters of guarantee and applications, granting Lozen extensive access to the South Base's weapons and formations.

Many people had reservations about this, feeling that this was the real reason Thunder agreed to cooperate with the South Base's human experiments, but Gu Qingqiu forcefully suppressed these voices and vouched for Luo Ze'en in her own capacity.

When many people learned that Luo Ze'en was making such a big fuss because Gu Qingqiu needed a level 5 zombie crystal core, they thought this behavior was simply insane! In the apocalypse, everyone is afraid and thinking about how to protect themselves, so why would anyone actively walk into danger?

Even so, they did not intend to stop Lozen, in case he succeeded, humanity might be able to reap the benefits.

Gu Qingqiu and Luo Ze'en didn't seem to care much about the selfish thoughts of others.

At the moment of parting, it seemed that their eyes were only for each other.

Luo Ze'en hugged Gu Qingqiu tightly, his voice filled with deep reluctance, "Dr. Gu, what if I die out there and never come back?"

Gu Qingqiu even had the mind to joke: "It's okay, I'll take good care of your child."

"Cough cough..." As expected, Luo Ze'en was so startled by the joke that he choked on his saliva, and glanced at Gu Qingqiu's stomach with a wary yet subtly expectant look.

"I was just kidding, don't be nervous." Gu Qingqiu patted Luo Ze'en's head and said seriously, "Don't worry, if something happens to you, I won't live either. I believe you can do it. You also need to be careful and protect yourself."

Gu Qingqiu's expression affected Luo Ze'en. He nodded and gritted his teeth, saying, "Don't worry, it's just a level 5 zombie crystal core! I'd go through fire and water for you, I'm not afraid of this! Wait for me!"

"Wait." Just as Luo Ze'en was about to turn and leave, Gu Qingqiu handed him something wrapped in a ball of red yarn. "These are handcuffs. Do you want to put them on?"

Upon seeing the familiar object, a strange emotion flickered in Lozen's eyes. He reached out and said with a double meaning, "Help me put it on. I'm doing this voluntarily."

"Click—" A cool touch came from his wrist, but Luo Ze'en had no intention of rejecting it at all. In his current mind, this was a talisman that Gu Qingqiu had given him.

Lozen left the South Base and his whereabouts are unknown, but the pulse data on his handcuffs, which kept changing, indicated that he was still alive.

Meanwhile, Gu Qingqiu was not idle. She used the level-four zombie crystal cores she had obtained to complete the development of a first-generation zombie vaccine.

The South Base was shocked by Gu Qingqiu's research results. Many people were impressed by Gu Qingqiu's talent. The laboratory also analyzed and studied the zombie vaccine and applied it to some mice and volunteers.

The results were outstanding. Gu Qingqiu used her research to prove the possibility of humans defeating zombies. The morale of the South Base was soaring like never before. However, because the level 4 zombie crystal core vaccine could not provide enough immunity, everyone began to look forward to Lozen bringing back the level 5 zombie crystal core.

And Lozen lived up to everyone's expectations. On the day he returned to the South Base, everyone gasped in surprise. Under everyone's gaze, Lozen kissed Gu Qingqiu and announced, "Dr. Gu, you are now my woman."

Gu Qingqiu hugged Luo Ze'en back and whispered in his ear, "Of course, I always keep my word."

The analysis and extraction of energy from the level 5 zombie crystal cores took a lot of Gu Qingqiu's energy. However, now that Luo Ze'en was personally by her side reminding her to eat and rest, if Gu Qingqiu was too busy to eat, Luo Ze'en would even feed her.

As expected, on the eleventh day after obtaining the Level 5 zombie crystal core, Gu Qingqiu finally analyzed the data she wanted and extracted the elements she needed. She then quickly organized the South Base laboratory to begin replication production and to check the safety of the vaccine.

Meanwhile, another hypothetical experiment was also underway under Gu Qingqiu's research. It was based on Gu Qingqiu's previous conclusion that a mutated gene could be extracted from the body of a superhuman. This gene, when combined with a zombie crystal core, could create a zombie vaccine and also create zombie "bait" to infect the zombie horde, causing the zombies to lose their attack power and ability to spread, thereby reducing the birth of zombies and preventing their evolution.

Now, the strongest superhuman in the human camp, Lozen, and the highest-level level 5 zombie crystal core are readily available experimental materials for Gu Qingqiu. As a result, she actually managed to develop zombie bait very easily.

After completing safety testing and putting the device into production, Gu Qingqiu, who had been tense for so long, finally relaxed and revealed a genuine and joyful smile, "Humanity is saved!"

Because of her recent exhaustion, Gu Qingqiu's eyelids had faint dark circles. Luo Ze'en hugged her tightly with heartache, "Dr. Gu, you are amazing! I am so lucky to have such an incredible woman by my side."

“Likewise.” Gu Qingqiu joked, “After all, you are also a powerful superhuman. Others only have one superhuman, but you have two.”

Upon hearing this, Lozen's expression instantly froze. "You... how did you know? Could your experiments possibly reveal what each person's special ability is?"

Oh no, what if Gu Qingqiu finds out that while he pretends to go back to his capsule to rest every night, he's actually always spying on her late at night? How is he going to explain that?

Luo Ze'en's flustered look amused Gu Qingqiu, who laughed and commented, "What a pervert."

"Then I'll show you what a real pervert is!" Luo Ze'en was so embarrassed by Gu Qingqiu's laughter that he simply shut her up with his mouth and used his actions to show Gu Qingqiu his perverted thoughts.

After everything was over, Gu Qingqiu fell into a deep sleep in Luo Ze'en's arms, exhausted.

Lozen couldn't sleep; he was excited, but his excitement was mixed with a vague sense of fear and worry. He had gotten what he wanted, and humanity could survive, but he still had a lingering unease.

He had always been an insecure person. Initially, it was because he needed to be constantly vigilant in the dangerous post-apocalyptic environment, which kept his nerves in a state of high tension. In fact, the days he spent in the South Base laboratory were relatively easy, since it was relatively safe there and he didn't have to worry about having his brain eaten by zombies in his sleep.

And now... Lozen feels the warmth of the woman's body in his arms, but he always has a feeling that he can't hold on to her. This feeling is very strange. She is clearly in his arms, and he has gotten what he wanted and done all the intimate things, but why does he always feel... that he can't keep her?