Da-seul, an outstanding student both in personality and academics, is eighteen this year. However, she has an unusual quirk—she loves makgeolli (Korean rice wine) so much that she secretly sips it even at school, carrying it in empty cosmetic bottles. Her family took over a traditional makgeolli brewery when they moved to their current town during her childhood. The brewery is known for sticking to the old-fashioned method of using only yeast, rice, and water, and its flavor is highly praised among the locals. The secret to its taste lies in a mysterious yeast that had been in the brewery since they took over.