State Councilor
Furthermore, Left State Councilor Park Eun framed Shim On by revealing that On's influence was overflowing . At this time, Shim-On had fulfilled his duty of Chief State Councilor by visiting the Ming Empire as an emissary of Joseon at Saeunsa (사은사; 謝恩使). He was just returning from his trip when he was arrested at the Korean territory of Uiju (의주; 義州) and transported under custody to the capital Hanyang, then to the city of Suwon (수원; 水原).