Hyde, Jekyll, and I

An incident at an amusement park causes the CEO to unjustly fire the circus troupe, but newly appointed leader, Jang Ha Na, refuses to accept it.

Seo Jin discovers that his alter ego Robin has made an appearance for the first time in five years. Ha Na is the sole witness in finding the man behind Doctor Kang's disappearance.

Jang Ha Na discovers that she and Robin have a connected past. Seo Jin's father is determined to get rid of Robin once and for all.

After discovering Ha Na is the trigger for what caused Robin to reapper, Seo Jin is determined to get rid of her.

Seo Jin has a hard time keeping his condition a secret when Robin not only moves Ha Na into their house, but joins her troupe on an overnight trip.

Ha Na is awkward around Robin after her drunken confession. The police figure out who the culprit behind Dr. Kang's disappearance is.

Seo Jin begins to develop an interest in Ha Na. The suspect in Dr. Kang's case reveals a shocking connection to someone close.

Seo Jin is extra stressed when faced with Lee Soo Hyun and the incident from his past, but while the case seems to be wrapping up-- it may only just be the beginning.

As the real villain hides in plain sight, Ha Na and Seo Jin are pushing themselves to find the truth-- but when the possibility of Doctor Kang being the culprit instead of the victim arises, it takes a mental toll on Seo Jin.

Lee Soo Hyun lures Robin to the site of the original kidnapping under the pretense that he's actually Seo Jin.

Ha Na finally learns the secret about Seo Jin and Robin, but one of them wasn't ready for her to know. Seo Jin enters the belly of the beast when he goes to Doctor Yoon for help.

Seo Jin has accepted Robin as a part of himself, but Robin struggles with his own identity. The incident from five years ago is revealed with a surprising twist to Seo Jin's illness.

Ha Na wants to help both Seo Jin and Robin, but Robin refuses to share her with another man. Seo Jin and Robin both formulate a plan to catch the real Lee Soo Hyun.

Seo Jin and Lee Soo Hyun finally have a conversation face to face about their past. All of the stress from previous events finally catch up to Ha Na.

Lee Soo Hyun holds Ha Na and Seo Jin hostage, demanding answers about the kidnapping from their past.

Robin begins to secure an identity of his own by establishing his personal, societal, and professional independence publicly.

Director Ryu devises ways to reveal Seo Jin and Robin's secret to the press in order to secure his position as CEO of Wonder Group.

Seo Jin and Robin finally start to learn about each other in an attempt to coexist peacefully, but some unexpected repercussions arise.

With hints of his impending disappearance around the corner, Robin takes matters into his own hands.

Ha Na and Seo Jin have trouble saying goodbye to Robin, but an unexpected occurrence may change things.