Following a sudden promotion in a leading assets-management firm, Chaeyoung, Dahyun, and Jungyeon learn from superior Nayeon that their company's real trade is in illegal shipments and human trafficking. Prodigial cryptographers Chaeyoung and Dahyun find themselves being used to further shady business aims all around Asia, but Chaeyoung gets caught in a dilemma when she tries to save Myoui Mina, a young geisha, from trafficking and exploitation. Meanwhile, Jungyeon reopens old wounds with ex-girlfriend Nayeon as they try to regain each other's trust in an expansive web of lies.