A fatal accident occurs during artillery training, but Chung Oon removes the body from the training area and continues the exercise. Disgruntled gunners have had enough of his merciless training. They react by taking the dangerous explosives and attempting a group desertion. Officers are split between those who think desertion must be punished and those who think Chung Oon is at fault for pushing them over the edge. It's up to Soon-shin to decide what to do. Meanwhile, Sonjo brings Yoon Dusu back and discusses with him ways to strengthen the command of the royal house. Yoon replies that competent warriors are in need and recommends Shin Lip and Won Kyun. Sonjo appoints Won Kyun as the Commander of the Right Kyungsang Navy.
—https://www.yidio.com/show/the-immortal-yi-soon-shin