Yoon Soo-wan and Park Dong-joo were each other’s first loves, but were forced to separate due to painful family circumstances. Soo-wan, who had been blind, eventually undergoes an eye transplant surgery that restores her sight.

Twelve years later, Soo-wan now works as an emergency rescue worker, while Dong-joo is a surgeon. They meet each other again. But Soo Wan is engaged to a Neurosurgeon, Kang Ji Woon. Knowing this, Park Dong Joo decided to keep quiet and not reveal his identity to Soo Wan and also decided to go back. Will Soo Wan realize that Doctor Dylan Park is her first love, Park Dong Joo? Will they end up together despite all the obstacles that they are going to face?

S.W.O.R.D. Chiku is a devastated and dangerous town with 5 gangs – Sannoh Rengokai, White Rascals, Oya Kohkoh, Rude Boys and Daruma Ikka – fighting fiercely. The name S.W.O.R.D. comprises of the first letter in each of these gangs. Before these 5 gangs, the legendary Mugen gang dominated the town. Mugen and the Amamiya Brothers (who did not submit to Mugen) clashed and Mugen disbanded, but …