For decades, the volcanic filters of Jeju Island have produced what is arguably Korea’s most ubiquitous consumer staple: Jeju Samdasoo. Now, the state-run bottler of the country’s top-selling mineral water is betting that the same basalt-filtered purity can command a premium in China’s cutthroat e-commerce landscape. Jeju Special Self-Governing Province Development Corp., which bottles the mineral water, and GS Global, the trading arm of GS Group, signed a deal Friday to launch a Samdasoo brand store on JD.com by July. The move marks a pivot from niche distribution — previously confined largely to enclaves of the Korean diaspora — to a full-scale assault on the Chinese mainstream. The decision to anchor the expansion on JD.com, a platform known for its stringent quality controls and a logistical network that rivals Western giants, is a calculated attempt to position the water as a luxury commodity. In a market where food safety concerns have historically driven a thirst for imported labels, Samdasoo is looking to ride the "K-wave" that has already seen Korean cosmetics and sn