Number for Seoul's Yangcheon Police Station - +82 2-2093-8324)
In the early 2000s, South Korea had a strain of murders and crime. One of these is an unsolved murder case where the key evidence happens to be a Mashimaro Rabbit sticker. To this day, the case, as of now, remains unsolved.
Sources -
https://ubitto.com/blog/events/6-scary-unsolved-crimes-in-korea/
