Kegzei (객제) is a small brewery in Buyeo, the last capital of Korea's ancient Baekje Kingdom. We are reviving Gwahaju (과하주), a Korean summer sool recorded for over 400 years that all but disappeared during the colonial era. Our first sool, Gamtanju, follows the traditional Gwahaju method: we first brew a clear rice wine, then add a distilled spirit made from rice, the old way of keeping sool sound through the summer heat. We use organic-certified rice grown by young farmers in Buyeo, together with Hallabong citrus, which gives Gamtanju its bright citrus aroma. 375ml, 13% ABV. Founder Taewan Kim left a career in tech to brew. Gamtanju was launched in December 2024, won the Grand Prize at the 2025 Korea Liquor Awards, and is now poured in over 100 venues in Korea and exported to Singapore and Europe. Kegzei (客製) means "made together with our guests". We believe a sool belongs to the people who drink it.