Go Sung-tae is the target of the bullies in his school... voluntarily. He is a part of a secret experiment by the government that aims to produce "Heroes" in hope of rivalling the other countries. Not wanting to get involved, he steers away from the prying eyes of the government by keeping a low-profile, being the "timid" kid.

The most popular girl in his school, with a strong sense of justice decides to follow him with the intention of helping him, only to discover that he was faking his personality. (On top of that, his secret got revealed.)

What will happen to Sung-tae now?