While Professor Yun, one of the world's leading authority on genetics, is abroad, Oh In-cheol and his fiancee Yun Jin-suk take the professor's papers from his laboratory. In-cheol and Jin-suk are researching the principle of the chlorophyll and a pill that can make people invisible. In-cheol becomes invisible and catches bank con-men and child kidnappers, etc. He works hard to expose society's evil and he is pasted all over newspapers. However, the criminals follow him and discover his identity. They steal his invisible pills. The criminals become invisible and they go on to commit their crimes such as robbing banks. But they don't have any pills to reverse the effects. The criminals ultimately come to In-cheol looking for the reverse pills when they are caught by the police.

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