This study critically examines the effectiveness of residency restrictions for sex offenders in South Korea by analyzing crime proximity and patterns. Using data from the 2015 Korean Ministry of Justice report, the study examines sex offenders under electronic monitoring from 2012 to 2014. The results show that crimes involving child victims occurred closer to offenders' residences than those involving adult victims, partially supporting the rationale behind residency restrictions. However, the proximity of crimes against unfamiliar victims raises questions about the overall effectiveness of these policies Regression analysis showed that prior offenses and IQ predicted crime distance, but alcohol use and psychopathy did not. The study concludes that residency restrictions offer limited protection and recommends a comprehensive approach, including monitoring and support programs, to reduce recidivism and improve community safety. Policymakers should consider additional measures beyond physical distance constraints to mitigate risks posed by sex offenders.