Born 1826 leo a young boy is sold into slavery as a test subject to a professor, minutes before his arrest the young boy is injected with a red exlir. "my boy if this works you'll thank me for eternity."

 Thrown in to the street by his own sister, leo promises himself he'll return a worthy man. Forced to live in the streets of seoul the teen must learn how to survive.   

Hongbin confesses to the members about his secret life he has been living....