Chapter 1: Brotherhood, 1938 - S1.E1

Four months after Lee Rang’s death, Lee Yeon resumes to be the nine-tailed fox on the condition that Lee Rang reincarnates. Meanwhile, an uninvited guest steals the guardian stone, and disappears "into the cabinet." Lee Yeon jumps into the cabinet and finds himself standing in Gyeongseong in the year 1938. He then encounters Lee Rang, who immediately just charges at his brother, yelling "Die!"