A terrorist that released a man-made virus, which killed more than 100 million people, was captured and sentenced to death.

Death is supposed to be the end of one's story, but the searing heat from the sun and the feeling of a forest proved that wrong.

He wakes up to find himself in a body of an orphan in a cultivation world called "Murim".
In front of him is a holographic panel that says:
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The host has met all conditions to unlock the virus system.
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Using the system, he can become stronger by releasing viruses that infect people.

Cultivation base? That can be obtained through infecting or killing people.

Techniques and knowledge? Those can be obtained from the ones he infected.

A selfish man with a system befitting his achievements, watch as he turns the entire Murim upside down using Virus Cultivation.
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Original Novel