When sex brings mysteries needed to be solved, a group of friends explore the underground world of lust, and discover their deepest darkest desires.

When Zoey's best friend Nant goes missing his twin brother Nont came to investigate. Zoey joins force with First to help Nont solve the case. Delving into Nant's past, the trio find themselves entering a dark communities of the sex industry (Aob/Puen), illegal pornography (Keen/Captain), online hook-ups with drug dealing (Nuth/Phop), covert sex work (Jump/Porsche) and sex-love revenge exposing human's darkest nature (Prom/Nont-Nant). In the meantime, Zoey, who's afraid of sex is seduced by his nude model Teena while First delves so deep into the ecstasy of sex when met with Soong, an ex-sex worker, that he might become sex-addicted. Will they find the missing person? Or will they discover some hidden truth about themselves through this daunting journey?