Synopsis

Jin Cheonhee undergoes rigorous training, involving separating rice grains with minimal energy and sewing with infused needle-work, all to hone his control. He plans a dramatic, personal delivery of ashes and a challenge letter for the sworn brother duel proposed by Haryoon. Meanwhile, the clinic's board game, 'Sapphire', gains popularity, attracting merchants and creating demand for other clinic items like ondols, leading to a focus on maximizing sales of popular items and dropping slow movers like soap.