Jeon Jin Ho is a straight guy who pretends to be gay in order to become a roommate to his female friend, Park Kae In. His hobbies include organization and ironing, and he’s known for his stoic poker face. He’s a stickler for cleanliness, but he also has a talent for figuring out women’s feelings. Kae In is very trusting even though she has a habit of being betrayed. However that doesn't stop her from giving people the benefit of doubt and Jin Ho is no different. How will Kae In react when she finds out that her gay roommate is not actually gay at all and that he has fallen for her?
Oh Tae Suk is a charismatic reporter who is the lead reporter for the society news division. Tae Suk is someone who never gives up until the truth is told. However, because of his personality, there are always conflicts within his team. During his training of the new junior reporters he discovered the potential of Seo Woo Jin and not only became her mentor but also her love interest.
Yoo Eun Ho (Son Yeh Jin), an instructor at a fitness club divorced her husband Lee Dong Gin (Kam Woo Sung) after the death of their new born baby as she blamed him for not being there for her when she needed him most. They remained friends after the divorce and met regularly. Even though both started seeing other people, they still had great feelings towards each other. With the help of YEH's sister Yoo Ji Ho (Lee Ha Na) and LDG's friend, Dr. Gong Jeon pyo (Gong Hyeong Gin), they finally realized that they should get back together.
The story tells the relationship between two married people, In-soo and Seo-young. They realised that both their spouses had love affairs with their partners after being involved in an accident. Their relationship grew as they approached each other for help occasionally.
Yoo Min-woo's (Song Seung Heon) first love was Soh Eun-hye (Shin Ae). No love was greater than the love between these two...until Eun-hye get's into a car accident. Eun-hye dies...leaving one thing left behind...her heart. Shim Hye-won (Son Yeh Jin) has suffered from a terrible heart disease ever since childhood. Miraculously she finds that she will be obtaining a heart from a donor, Soh Eun-hye.
Suffering from the pain of a heartache, Min-woo goes to Paris to study...the memories of Eun-hye still rest in his heart. When he returns to Korea, fate takes a turn and brings Hye-won and Min-woo together. When the two first meet, Hye-won's heart (Eun-hye's heart), oddly beats faster when she is around Min-woo.
Park Jung-jae (Ryu Jin) is Hye-won's boyfriend. Park Jung-ah (Han Ji Hye) is Jung-jae's sister and she meets Min-woo in Italy and falls for him...
Hye-won doesn't know why or what she feels when she's with Min-woo...and Min-woo feels guilt toward Eun-hye, because the feeling of love rises once again as he continues to see Hye-won...