♂?，，

  Lin Fei looked at the letter in his hand, and a similar letter would also be received by Crazy Doctor.

  Soon, the intercom in Lin Fei's room rang, displaying an urgent message that Crazy Doctor was calling him.

  Lin Fei was now the eldest disciple, having passed through layers of checkpoints and arrived at the high-level research room of Crazy Doctor. At this moment, Crazy Doctor looked at the letter in his hand, his tone as if he had aged over a decade.

  "The sample of the highly contagious C virus has been collected, and the analysis results are not good. If no antibodies are produced, this terrifying mutant virus will destroy human civilization." Dr. Crazy said seriously to Lin Fei.

  "With Master Crazy Doctor's grasp of cellular viral genetics and a vast amount of knowledge and experience, I believe we can develop an antibody soon." Lin Fei said with a try-and-see attitude.

  "That's right, Lin Fei. With my medical knowledge as the Crazy Doctor, it is possible to develop an antidote for this highly toxic C virus. But look at my body now and you'll know the reason." The Crazy Doctor said, lifting his white coat and holding a scalpel that sliced towards his chest.

  Lin Fei was about to step forward to stop his nominal master's suicide, but when he saw what was cut open under the skin of Crazy Doctor, Lin Fei also froze.

  No bloody scenes as imagined, no flesh and organs, only metal wires and complex circuit boards.

  "The real Crazy Doctor himself had passed away ten years ago. However, in order to find an outstanding successor and pass on his medical legacy, the Crazy Doctor had someone manufacture this robot that looks like him before he died. He also input some medical knowledge into me and left behind three phases of medical teaching content. I was to use a virus to select his heir. Having successfully completed the three phases of testing, I now possess the highest authority in the laboratory."

  Although my chip has recorded a lot of knowledge about viruses, cells and genetics, when faced with new viruses, I simply can't develop antibodies.

  "This highly contagious and deadly C virus is spreading through the air, water sources, bodily fluids, and blood. As for the later stages, it's still unknown. The 2 million people in Black Emperor City are facing this high-risk C virus, with only death waiting for them. The only one who can save them, and Pandora, is Lin Fei. This virus mutates extremely quickly. When Pandora left the underground research facility, the detection equipment showed that it didn't have such strong infectivity back then, and could only be transmitted through bodily fluids. Now, just a few hours later, it can already be transmitted through air and water." The robot with exposed circuit boards on its chest, Dr. Crazy, said to Lin Fei.

  "I knew the system wouldn't let itself take shortcuts." Lin Fei thought to himself as he sat down at the main control position in this high-level research lab, studying the collected highly pathogenic C virus samples.

  And Robot Crazy Doctor stood beside Lin Fei, helping out.

  Time passed quickly, Lin Fei analyzed the high-risk C virus information, constantly using his ability to go back three minutes, but every time Lin Fei grasped some information about the C virus, it would continue to evolve and mutate. Lin Fei was too tired, he could only let the robot pretend to be Dr. Crazy, ask someone to move the sleep chamber into this advanced research room, and rest himself to replenish his spiritual energy.

  However, after Lin Fei slept for a while and woke up, he found that the highly pathogenic c virus had mutated even more severely, and even its original appearance could not be found.

  －－

  Time passed quickly, Lin Fei was in the underground laboratory, crazily studying the information of high-risk C virus, but there was no substantial progress.

  The C virus broke out in the city of Hei Di Si, infecting all citizens at the first moment. Fortunately, Dr. Crazy's robot contacted the military immediately. The city of Hei Di Si was isolated from several kilometers outside, with a high isolation wall and thousands of automatic radiation turrets built. Not even a bird could fly out of Hei Di Si City.

  High-risk C virus causes human cells to mutate rapidly and gradually die, leading to physical weakness, coughing up blood, high fever, and eventually death.

  Because the infected are physically weakened, in the city of Hades, even if a large-scale viral infection breaks out, there are rarely any incidents of looting and rioting, because all the citizens have been infected, lying in their own rooms, weak and lethargic.

  In the first week of the high-risk C virus outbreak, Lin Fei's War God system displayed: The death toll from the C virus in Heidis City had reached 15%. Lin Fei's research on the C virus was progressing slowly.

  In the second week of the high-risk C virus outbreak, Lin Fei's War God system displayed: The death toll from the C virus in Heidis City had reached 45%. Lin Fei had developed dozens of antibodies, but they were not very effective. In the face of constantly mutating viruses, there was no suitable antibody that could successfully suppress them.

  Lin Fei looked at the terrifying and still rising death toll data, forty-six percent, forty-seven percent, forty-eight percent...

  Lin Fei knew that soon, this doctor's part-time career change task would fail. In three days, when the mortality rate of the high-risk C virus in Heidis City exceeded 60%, he would no longer be able to return to his original world and would have to stay in this viral medical world to survive.

  With two days left, Lin Fei began to review the task description of this medical world again.

  "Task completion conditions: The host develops a drug against the C virus, and within one month of the outbreak of the C virus, the mortality rate due to the C virus in the city is reduced to below 60%."

  Mission requirements: Prohibit the host from using or indirectly using any force to complete the mission. Once force is used, the mission will be declared a failure.

  Suddenly, Lin Fei looked at this information and felt that he had discovered something crucial that would allow him to successfully complete his mission and return to the original interstellar world.

  "Develop a drug to counteract the C virus, reducing the mortality rate of the C virus to below 60%. Alright, we can use an even more potent virus. Before the C virus kills the citizens, kill them first with our own virus. As long as it's something we've developed ourselves, it's fine. Kill off all the remaining citizens in Blackthorn City and that will satisfy the requirement of a mortality rate below 60% due to the C virus. That way, we won't even need to use military force."

  Lin Fei thought about it and immediately searched for the latest information on the deadly virus toxin that had been developed in the room recently.

  Then, the robot fake crazy doctor was opened, and began to continuously use his abilities. In this advanced laboratory, a more rapid and deadly cell toxin "D virus" with strong transmission power was developed. The virus was filled into several test tubes, Lin Fei put on a closed protective suit, took the elevator, and went up to the city of Black Emperor.

  Lin Fei looked at the records of the War God system in his mind, and saw that there were still 2 million people alive in the city of Heidies. However, 50% of the population had already died, and half of the remaining people were seriously ill in bed.

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