DUPAGE COUNTY, Ill. (WLS) -- Four women have been arrested for prostitution and unlicensed massage therapy in unincorporated Willowbrook, according to the DuPage County Sheriff's Office.Seong H. Shin, 43, of Woodridge was charged with one count of prostitution and one count of unlicensed practice of massage therapy. Gi S. Jun, 43, Munseon Luna, 40, and Youn H. Kim, 46, have all been charged with one count of unlicensed practice of massage therapy. All charges are misdemeanor.An undercover DuPage County sheriff's officer received a tip from a concerned community member about alleged prostitution at Pine Tree Spa on Route 83. Sheriff's officers say the undercover officer was able to set up a meeting at which time the suspect offered to perform a sexual act in exchange for money, triggering the arrests.All four women are being held at DuPage County Jail until they post bail.