Yi-eon, a palace worker, gets appointed as the new secret royal inspector; Jo-yi strives to get a divorce from her gambler husband and turns to her best friend for help.

When another murder takes place, Ra Yi-eon is left with no other choice but to investigate the matter; Jo-yi finds something strange at Bo-ri's place.

Yi-eon helps Jo-yi get approval for her divorce; an assassin shows up at the local office; Jo-yi visits Hanyang and spends the night at a shrine.

Yi-eon and Jo-yi plan to infiltrate Soyang Trading Group and rescue children from their cruel master; Jo-yi encounters a familiar ghost and decides to tail it. Soon, she discovers some unexpected secrets about it.

Yi-eon intends to protect his people; Yi-eon wants to keep Jo-yi with him; Park-seung sends his son, Do-soo, to meet with Tae-soo after he learns something strange about Tae-soo.

Yi Eon looks for a way to enter the base of the Tae Seo; Joy is shocked to learn that Bori's death was not an accident; Joy declares that she will join Yi Eon's investigation to catch the man who killed Bori and find more evidence about the book.