The last resident of Reviva, and the owner of the treasure "Eternal Water'' that Jing and Kir were looking for. He is also the creator of Vermouth and Villar. For many years, Cointreau had been thinking about the study of perpetual motion and its meaning. He entrusts the "Eternal Water'' to Jing and then takes his last breath. In addition, Jing gave up drinking the water, saying, "If I drink something like this, I'll never be able to see my mother again.''