CREATE TABLE table_39813 ("Year" FLOAT, "Mission type" TEXT, "Shogun" TEXT, "Ry\\u016bky\\u016ban King" TEXT, "Lead Envoy" TEXT, "Number in entourage" TEXT)

Who was the lead envoy of the mission with the Ry ky an King sh eki?
SELECT "Lead Envoy" FROM table_39813 WHERE "Ry\u016bky\u016ban King" = 'shō eki'
SELECT "Lead Envoy" FROM "table_39813" WHERE "Ry\u016bky\u016ban King" = 'shō eki'