After completing the [LoML] Yeonhwa and Dolswe questline, travel to Old Lady Sooni (https://bdocodex.com/jp/npc/59960/14/) and start the quest chain. As you progress, you will come to a Crossroad. [Crossroad] Help Gapol and [Crossroad] Report to the government office. Based on the description for this knowledge, you need to report Gapdol. 'You couldn't just look the other way and reported Gapdol to the authority.
This knowledge should also complete the Story "Between Tragedy and Comedy IV: The Traveler's Report