Sung Jun

Gu Seo Jin is a third-generation chaebol who runs the theme park Wonder Land. He seemingly has everything — looks, brains, and fortune. But a traumatic incident in his childhood resulted in Seo Jin having a split personality — one is a cold, ruthless man, while the other is the polar opposite, someone kind and gentle. Because of this, he vows never to date or marry. Seo Jin wants to get rid of the circus show at Wonder Land due to low ticket sales and high overhead costs, but he butts heads with circus master Jang Ha Na. Ha Na insists on saving the failing circus and dreams of revamping it back to its former glory. She soon finds herself falling for both of Seo Jin's personalities. (Source: AsianWiki) ~~ Adapted from the webtoon "Dr. Jekyll is Mr. Hyde" (지킬박사는 하이드씨!) by Lee Chung Ho (이충호).

Soo Hyun, a renowned American psychologist, returns to Korea and opens a psychotherapy center, only to have his clients stolen by a fraud fortune-teller, Hye Rim, with her uncanny ability to read minds. Seeking revenge and for research, Soo Hyun creates a psychological experiment to make Hye Rim fall in love with three men, including himself. As Hye Rim, once cynical about love, gets caught in a whirlwind romance with all three men, her views begin to change. Will she stay in love with Soo Hyun after discovering she's part of his experiment? (Source: MyDramaList)

Nam Ha Jin works as a plastic surgeon and he is a warm-hearted type of fellow. He has been in a relationship with Yeo Reum for 3 years and they love each other. Then, suddenly, her ex-boyfriend Kang Tae Ha appears in front of her and begs for forgiveness.