The time of scorpions

After her younger sister's death under her nose, 'Seung-ah' grabs a revolver and heads it to the perpetrators by revenge. Unfortunately, she fails and also becomes another victim in reverse. A woman called 'Head-hunter' of secret agency 'The time of Scorpion' shows up in hospital and scouts Seung-ah as an agent. Seung-ah accepts her proposal and joins the nationwide organization which punishes notorious criminals. She tries to train harder than others and becomes one of the best agents.
And Seung-ah gets close to a mysterious woman named 'Yu-rim' and finds out that she is a head of the dark-crime organization called 'Faust' which was a group concealed Seun-ah's sister's death. Now, Seung-ah aims to her own revenge to and it's time to bump heads between 'The time of scorpion' and 'Faust'.