Cha Eun Ho is a successful and handsome writer who is also the youngest chief editor at a publishing company. He has a calm demeanor and remains reasonable at work. He then becomes involved in the life of his childhood friend, Kang Dan Yi who was once a popular copywriter. She is now divorced, a single mother, unemployed and struggling in life though still attempts to find a job, but even with her once good career, she cannot. However, in a desperate attempt to find a job, she lies about her background and begins to work as a temporary worker in the same building under none other than Cha Eun Ho. As they become involved in each other's life more than often, a love story begins to unfold.

Eun Hwan-Ki is the CEO of a public relation company but he's extremely shy. Due to his personality, his employees don't know him well. Chae Ro-Woon begins work at Hwan-Ki's company. She's energetic and recieves recognition for her work, but her only interest is the CEO. She plans to reveal who Eun Hwan-Ki really is.

Pete is a handsome and rich university student who is incredibly timid. His shyness stems from his trying to hide that he is gay. One day, Pete gets hit by a boy on a bike. The kind-hearted boy, named Ae, apologizes and helps him up. In the past, those whom Pete trusted often used him for his wealth. Ae now steps in so Pete won't be taken advantage of by his frenemies. Over time, Ae looks out for Pete and protects him from the world. Somewhere between their intense closeness and shared soft touches, Ae develops feelings for Pete that go beyond friendship. Pete doesn't want Ae to know the pain of being ridiculed for dating a man, so he ignores his own feelings for Ae. But Pete falls deeper and deeper in love with the kind-hearted boy on the bike, who once hit him purely by chance.

Three very different young men - Dong Goo, the bad luck incarnate who dreams of becoming a film director, Joon Ki, an eccentric actor who performs to make a living, and Doo Shik, a freelancer writer who fiddles around doing nothing most of the time - open a guest house named "Waikiki" in Itaewon where many foreigners come to stay. Although they have no clue how to run it, they're eager to earn money to pay for the production of their upcoming film. Joined by Dong Goo's younger sister Seo Jin, who actually manages the household in Waikiki; single mother Yoon Ah, who has made an unexpected landing in the guest house with her mysterious baby; and Dong Goo's ex-girlfriend Soo Ah, they all start living together in an uncomfortable and suspicious atmosphere.

Ra Eun Ho (Kim Se Jeong) realizes all too painfully that her high school doesn't support students like her who don't have the grades, wealth or connections. Despite her low school ranking, she still dreams of using her talents as a webtoon artist to get into Korea University to be with the boy she likes. Her best friend, Oh Sa Rang (Park Se Wan), is the daughter of the school janitor. She already knows that college is not a realistic goal for her so she already has her mind set to studying for the civil service exam. Despite having a lower ranking than Eun Ho, the moody Hyun Tae Won (Kim Jung Hyun) has a wealthy father who is an investor in the high school. So teachers look the other way in the face of Tae Won's bad behavior and poor school performance. The children of wealthy families get the best education that money can buy, with expensive study materials, private tutors and cram schools. But Song Dae Hwi (Jang Dong Yoon) is No. 1 in his class, despite being poor and having an alcoholic mother who does little to help him. He is forced to tutor other rich kids like Kim Hui Chan (Kim Hee Chan) for the money, while the beautiful Hong Nam Joo (Seol In Ah) seems to be dating him just to get his study notes. When a mysterious student starts causing trouble at the high school, Eun Ho is wrongly blamed. Can she catch the real culprit to clear her own name so that she can still strive to go to college?

Eun Bong Hee is a prosecutor trainee who unfortunately becomes a murder suspect. Noh Ji Wook who is a prosecutor tries to help Eun Bong Hee but loses his job in the process. After the prosecution, Eun Bong Hee who is free from the crime falls in love with Noh Ji Wook. But Noh does not accept her love towards him but offers to help her in finding the real suspect. In the mean time the real murderer plots a plan to avoid being caught.

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