Seung Jae is a highschool student who suddenly passed away due to a traffic accident. At that time, he was dating Su Ah, a fellow student. After a year, Su Ah receives mails containing secrets surrounding Seung Jae. Turns out Seung Jae, at that time, was cheating on Su Ah and dating his friend's, Du Hyeon, sister, Eun Ho. In addition, Dong Cheol, a fellow student who aims to become a football player, quit attending his extracurricular activities after Seung Jae's death and no longer shows up at school. With the mails received, Su Ah's secrets start being revealed one by one.

After Seo Han Eul lost her mother in a fire, she was later adopted by a wealthy family and experienced a life of many twists and turns. Seo Gun's father had married an unwed mother, thus making Han Eul his sister in the eyes of the law. After their parents passed away, Han Eul was adopted by a wealthy chairman of a large organization who has also become a gangster. Upon using Han Eul to extort money, Seo Gun and Han Eul slowly fall in love with each other.

Feisty, bubbly, and no-nonsense, Chae Gyeong is an ordinary high school student until one day when she receives some unexpected news. Because of her grandfather's will, she must marry the unendurable Crown Prince Yi Sin who also happens to attend her high school. Chae Gyeong initially resists the proposal before reluctantly agreeing to marry him to help her debt-ridden family.

Ono Yuta flees from the responsibilities of his family's business and attempts to get into college to get a girl. By a twist a fate, he then finds himself living with five beautiful young ladies. Paradise for some but hell for Yuta, the clumsy one.

A man who's still a virgin, has a very very rare disease which allows him to only have sex seven times in his life. After he has used up all the seven chances, he will never ever be able to have sex again for the rest of his life... and so far, he has wasted two times on 'self gratification'. Now he only has five times left, and he wants to choose carefully and save himself for that someone special...but at the same time he desperately wants to lose his virginity...

2nd House tells a story of a low income, white-collar worker named Koichi, who has a really bad relationship with his wife. Koichi doesn't have a strong status in the family and so he wanted to find a '2nd House'. He then meets up with Aki and they developed a strong love for each other....

Lee Dong Jin and Yoo Eun Ho divorced two years ago but continue meeting for various reasons, often at the donut shop where they once dated. They check in on each other's love lives and create excuses like anniversaries to stay connected. Despite their deep love, they struggle with pride and others' interference, leading them to introduce new people into their lives.

To escape debt, Lee Su Ho's father fled to a remote island where he met a friend with a young daughter, Eun Young, the same age as Su Ho. After being abandoned by his father, Su Ho planned to leave, but Eun Young's pure heart changed his mind. Tragedy strikes, and Su Ho disappears while Eun Young is in the hospital.

Promising film-like production values, this show tells the story of an adopted lawyer from Canada (Lee Sung Jae), a Korean singer dreaming of escaping abroad (Kim Min Jung) and her manager (Uhm Tae Woong). However, the two boys are lost brothers, and they love the same woman.