MU Online is a fantasy MMORPG developed by Webzen and first released in South Korea in 2001, later spreading worldwide with a loyal long-term player base. Jewels such as the Jewel of Bless and Jewel of Soul are among its most sought-after upgrade items, used to improve weapons and armor. Because these drops are rare and valuable, their pickup sound became instantly recognizable to the community. Clips of the chime now circulate on soundboards and in nostalgic gaming videos, where veteran players recognize it immediately as a sign of good fortune.