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!"

After saving Lee Rang, Lee Yeon fails to return to the present, so he visits Taluipa of the 1930s, who asks him to work for her until the Gate of Time reopens. Under Taluipa's orders, both brothers board a train to find the Legendary Pipe. Inside the train is a woman who prepares to greet Lee Yeon, Shinju who devises an escape plan, and an hourglass that indicates the approaching overpass.

There's a "big rice chest" covered with amulets, and Moo-yeong appears before it. He is then seen carrying a blindfolded young girl, who removes her blindfold and chimes her bell saying, "Where are you? Found you!" Lee Yeon opens his eyes and meets her gaze, only to wake up screaming. That afternoon, after seeing Hong-joo holding a bouquet of flowers, everything goes black before his eyes...

A strange basket appears in front of Myoyeongak. Inside it is a living, breathing baby with "7 red moles" on her forehead. Although both brothers secretly attempt to place the basket on someone else's doorstep, they return to find it sitting right where it was found?! Meanwhile, red-white mask steals from Gyeongseong’s gold mining royalties in search of the "golden ruler" that revives the dead.

Inside Myoyeongak, detectives, who're here for baby, are confronting Lee Yeon and Lee Rang. A scuffle breaks out, while Mi-ho innocently smiles within the bubbles. Meanwhile, Hong-joo arrives in Manchuria where she finds "Lee Yeon in 1938" drunk on opium. Lee Yeon calls for "Ah-eum," to which her face turns cold. Just as she turns to leave, Lee Yeon from 1938 calls out and hugs her from behind...!