January is going to be the month of multiple personalities. Two big dramas (Kill Me, Heal Me and Hyde, Jekyll, and I) are both premiering in the next few weeks, and both revolve around a male lead who suffers from Dissociative Identity Disorder (multiple personalities). Between the two shows, we will have a grand total of NINE personalities running around on the screen. In case the similar themes have you confused, here's a little breakdown of the two dramas:

Kill Me, Heal Me

Premiere date: January 7 (Wednesday/Thursday)

Male lead: Ji Sung as Cha Do Hyun, a third-generation chaebol

Number of personalities: 7: His regular personality, a cool guy, the mysterious Mr. X, a seven-year-old girl named Nana, twin high school students, and a fisherman

Female lead: Hwang Jung Eum as Oh Ri Jin, a first-year medical resident

Second Male Lead: Park Seo Joon as Oh Ri On, Oh Ri Jin's "twin" who was actually secretly adopted (Please tell me he won't fall in love with his "twin." Please!)

Second female lead: Kim Yoo Ri as Han Chae Yeon, Do Hyun's first love

Writer: Jin Soo Wan (The Moon that Embraces the Sun)

Watch Park Min Young and Ji Chang Wook team up in the thrilling action romance Healer:

Hyde, Jekyll, and I

Premiere date: January 21 (Wednesday/Thursday)

Male lead: Hyun Bin as Koo Seo Jin, the president of an amusement park

Number of personalities: 2: One is kind and sweet, and the other is cold and heartless

Female lead: Han Ji Min and Jang Ha Na, a circus performer at the amusement park

Second male lead: Sung Joon as Yoon Tae Joo, a gentle hypnotherapist

Second female lead: (Unconfirmed) Seo Ye Ji as Oh Joo Yeon, a psychiatrist and Seo Jin's first love

Writer: Kim Ji Woon (Cheongdamdong Alice)

Fun fact: Both dramas are a reunion for their lead actors. Ji Sung and Hwang Jung Eum appeared together in last year's melodrama Secret, and Hyun Bin and Han Ji Min shared roles in the movie The Fatal Encounter.

Which of these dramas will you be watching? Ji Sung and his seven personalities in Kill Me, Heal Me, or Hyun Bin and his cold-hearted alter-ego in Hyde, Jekyll, and I? Why not both? You can sign up for new episode alerts of Kill Me, Heal Me HERE and Hyde, Jekyll, and I HERE.