C402 Director Niu's Secret

After that, the research sank into the ground and went into the secret research. From that time on, the research on the 'Three Disappearances' never spread among the people. From that time on, all kinds of rumors about the 'Three Disappearances' began to spread.

Ten years ago, Principal Niu's only son had accidentally been infected by this poison during his research and died within a week