“I, the Executioner,” currently the No. 1 movie in Korea, having surpassed four million admissions only six days after its opening in cinemas on September 13, promises to deliver even more thrilling action. Director Ryoo Seung-wan, who also directed “Veteran,” shares, “My affection for the character Seo Do-cheol has grown over time, and I always wanted to create a continuation of his story.”