Soon-shin proposes peace with the Jurchen tribes. He tries with all his might to arrange a hostage exchange for Gobdan, but Yi Il's reaction is lukewarm, and the royal court is indifferent to Soon-shin's outcry about finding a tangible solution to the problems at the northern borders. While the hostage negotiation is in progress on both sides, in an unrelated incident, Won Kyun ends up killing a member of the Jurchen tribe who was doing illegal trade with one of the locals. The next day, Gobdan's cold body is found.
—https://www.yidio.com/show/the-immortal-yi-soon-shin