The chasity of the most beautiful women of the Joseon has fallen! Maewol-dang is a gisaeng house located on the outskirts of Hanyang in the early Joseon times. With madame Wol-gi in the lead, there are Nok-su, Chunhyang, Sim-cheong and other beautiful gisaeng's living there. One day a party happens in the gisaeng house and the reason is Wol-hyang's long time lover and Lord Park Pan-seo has come back to Hanyang for the first time in 8 years. Nok-su has always been jealous of the Madame position so she schemes to seduce Lord Park and take over authority. One rainy night, a woman in a Kimono bangs the door of the Maewol-dang. Servant Kong-ji opens the door and this Japanese geisha named Namikko asks to meet Wol-hyang. Meanwhile, the next morning, a male servant named Dol-se is found dead, stabbed by a hairpin that Chunhyang lost and hell breaks loose in Maewol-dang. Wol-hyang's close nephew Lord Lee Joon-ki comes to Maewol-dang to rest his weak body.
An extremely wealthy elderly man dying from cancer undergoes a radical medical procedure that transfers his consciousness to the body of a healthy young man but everything may not be as good as it seems when he starts to uncover the mystery of the body's origins and the secret organization that will kill to keep its secrets.
The story of a super-secret spy organization that recruits an unrefined but promising street kid into the agency's ultra-competitive training program just as a global threat emerges from a twisted tech genius.