Won Kyun is discharged only days after he begins his new job as the High Commander of the Left Cholla Naval Station. Outraged by the king's order, his men refuse to accept Won Kyun's dismissal. Won Kyun calms the men down telling them to build a strong navy and vows to return to the post someday. Yu Sung-ryong recommends Yi Soon-shin to replace Won Kyun, but he is faced with opposition from both the Easterners and the Westerners. To make his decision, King Sonjo secretly calls Soon-shin to the palace and asks Soon-shin if he can step over Won Kyun and take his post.
—https://www.yidio.com/show/the-immortal-yi-soon-shin