"Until every last sword of tyranny against the people is withdrawn, do not let this sword out of your hands." When Mijin finds Soon-shin missing, she goes to Won Kyun, and Won Kyun take a navy vessel out to an island that illegal trading is taking place. Soon-shin, Won Kyun and Won Kyun's men successfully stop the crime. His master Namgoong Du tells him that... Won Kyun goes back to the naval station prepared to face punishment for taking action against the Right Naval Commander's orders, but much to their surprise, he is praised for his brave actions and Soon-shin is absolved for his previous crime. They find out that the political power had shifted in the court with Queen Dowager's death and Yoon Won-hyung no longer had any authority. Soon-shin is clear of all charges and free to take the military service exam. But he struggles with the fact that he has taken human lives.
—https://www.yidio.com/show/the-immortal-yi-soon-shin