Busan Police said they apprehended 32 gang members and dealers Wednesday for trafficking and using methamphetamine.
They allegedly smuggled the narcotics into the country using a parcel service. The detectives confiscated methamphetamine worth 18 million won.
A 43-old dealer surnamed Suh and two others are suspected of selling methamphetamine to gang members who resold the drugs to others, investigators said.
The detectives added the men used the delivery service as it does not require the contents of parcels to be checked.