Mu Zhengyi continued, "Using potassium chloride, although potassium chloride itself is not toxic, it has a strong irritant effect on the human heart, especially for patients like Kawamoto Kuraji who already have symptoms of heart blockage, it can be absolutely fatal!"

Upon hearing this, Ning Zhiheng hesitated for a moment. He had some basic knowledge of medicine, and asked with some doubt, "As far as I know, although potassium chloride can cause heart mutations and lead to death when ingested, the dosage needs to be quite large. If the Japanese were to conduct an autopsy, they could detect something amiss."

The task assigned by the Chief was to assassinate Kawamoto Kuraji without arousing suspicion from the Japanese or causing diplomatic disputes. If the final result aroused suspicion from the Japanese, then the mission would be a failure, and it would be better to abandon the operation.

Mu Zhengyi was quite surprised to hear Ning Zhiheng's answer. He knew that in this era, due to the lack of education, especially Western education, even highly educated people rarely knew anything about Western medicine. He did not expect that Ning Zhiheng could clearly understand the drawbacks of this method as soon as he opened his mouth.

It's easy to see that this young team leader Ning has solid knowledge and a wide range of interests. He is definitely not the kind of assassin who only knows how to cause destruction and assassination, as he had imagined. It seems that he had underestimated these agents who live in the shadows.

He nodded slightly and continued, "Zhiheng's concerns are very valid. There is indeed a problem. Let's consider using an injection. If we use potassium chloride injection, the required dosage is one-twentieth of the oral dosage, which is about 10 milliliters per syringe. Moreover, Kawamoto Kuraji already had early symptoms of myocardial infarction. I am certain that only 5 milliliters of injection would be enough to kill him. Potassium chloride itself is not toxic. With such a small dosage, even if the Japanese perform an autopsy, they will only be able to find symptoms of myocardial infarction and will not be able to find any other cause."

Liu Tongfang chimed in, "That's a good method, but while we can use poison for oral administration, direct injection is much more difficult. We need to subdue Kawamoto Kurashi without alerting anyone and force him to inject the drug, which is very difficult to do!"

Ning Zhiheng also carefully considered the pros and cons and still felt that using the injection method was safer, since this would ensure that the Japanese would not notice anything unusual, which was the most important thing.

As for whether he could subdue Kawamoto Kuraji without alerting anyone, he didn't think it would be a big problem.

He had close contact with Kawamoto Kuraji today and could see that his physical health was worrying. He looked significantly older than the average person, and his muscles were loose and weak. Perhaps he had received training when he was young and had good fighting skills, but now, given his physical condition, he no longer has the foundation to have good fighting skills.

Ning Zhiheng was confident that with his fighting skills, he could subdue Kawamoto Kuraji in an instant, and then forcibly inject potassium chloride solution, and everything would be done.

Ning Zhiheng slammed his hand on the table and decisively said, "Then let's choose the injection!"

Then he asked, "How long does it take for the injection to be lethal?"

Mu Zhengyi immediately replied, "Very quickly, within five to ten seconds, or even faster. Given Kawamoto Kuraji's physical condition, I estimate it will be within five seconds. Also, it would be best to inject him on his ankle, where the skin has more folds and is more concealed, so the tiny needle marks left will not attract the attention of the Japanese."

Mu Zhengyi's consideration was very thorough. Ning Zhiheng nodded repeatedly upon hearing this. He pointed at Mu Zhengyi with his finger and jokingly said, "You doctors are really something! You can kill without shedding blood; your methods are much more sophisticated than ours!"

Mu Zhengyi laughed heartily, showing no sign of unease. He waved his hand and said, "To paraphrase a saying, medical skills have no borders, but doctors do have nationalities. The Japanese invaded the three northeastern provinces, occupied our land, and then took over Shanghai, directly threatening the heart of China. Their intentions are obvious to everyone. They are a major threat to the Chinese nation. I don't think it's wrong to use my own knowledge and strength to fight the enemy. I only regret that I can't take up arms and serve on the battlefield, and can't kill the enemy with my own hands. It's a great pity!"