A traumatic childhood experience leaves Cha Do Hyeon, suffering from memory loss and dissociation. The latter has resulted in the creation of seven distinct personalities. Wanting to regain control over his life, he asks Oh Ri Jin, a first-year psychiatric resident, to help him, but she eventually falls in love with one of his personalities. Ri Jin’s twin brother, Oh Ri On, a famous mystery novelist, investigates Do Hyeon and his family

Risa is happily married to her colleague Dr Aik for 10 years. She is a nurse in her 30s and have been trying to have children. Dr Aik unexpectedly asked for divorce and Risa's whole life came crashing down when she realizes her husband had betrayed her with her long time friend Gaysari. When Sunida, who also lost her husband to Gaysari, encourages Risa to hurt Gaysari in a similar way, Risa meets Pong, Gaysari''s 18 year old son. Pong works as a prostitute to forget his lack of love from his wealthy but neglectful parents immediately gets attracted to Risa. But it gets more complicated when Risa starts to have feelings for him.

As part of a superstitious marriage to ward off bad luck, teenagers Praomook and Chalantorn are temporarily married to help Chalantorn's luck. Chalantorn has always thought of Praomook as an ugly duckling and a nuisance, while she has always been in love with him.
Years later, they meet again by chance in South Korea, where Chalantorn gets shot. Believing that the misfortune is back again, his parents ask Praomook to marry him to dispel it. In exchange, they offer to buy back her father's house, which they lost due to his debt and was a burden on her. Praomook agrees to marry him, vowing to make him fall in love with her to get back at him, while Chalantorn believes she is manipulative and selfish. To get rid of her, Chalantorn pretends to be in a gay relationship with his best friend, Rut, who is attracted to Praomook and wants to win her over.
While looking for the person who is trying to murder Chalantorn and spending their days trying to challenge each other, Praomook and Chalantorn fall into a love-hate relationship.

Kang Bok Gu is a tough guy and a K-1 Fighter. Bok Gu is a character who is dynamic in nature and grew up in a foster home. He falls in love with a woman whom he should not love. It was because of the woman that his emotionally wounded brother fell off the rooftop and became a nursing case. So, his love is forbidden and inevitably tragic.

The woman is Cha Eun Seok, who is a TV talent and movie actress. It is not that she jilted his brother on purpose, but upon a basis of misunderstanding, his hatred toward Cha Eun Seok grows more and more burning.

By becoming Cha Eun Seok's private bodyguard, Bok Gu concretely practices his revenge upon her. He only desires 'to bring his brother's woman to her knees. He is gradually taking Cha Eun Seok to destruction while he feels his love for her growing deeper and deeper in his heart.

Bok Gu is a cold guy character without any special concern for women. The martial art of hand-to-hand fighting was just a kind of escape he chose from the shock of a spinster's death whom he loved from a distance.