34-year-old Motoko, an employee at a credit union, is stunned when she learns her best friend and co-worker, Mariko, has embezzled 300 million yen and disappeared. Motoko, still un-married, lives at home with her parents and has no future plans or goals. Tired of her monotonous, mundane lifestyle, she decides to move out and live on her own. She happens upon a beautiful old geshuku, or lodging house, called "Happiness Sancha." The building is surrounded by lush vegetable and flower gardens, and is nestled right on the riverbank. There are only 2 remaining tenants; Natsuko, a college professor who has lived there since she herself was in college, and Kizuna, an erotic manga artist whose work doesn't sell much. The manager, Yuka, is desperate to take on more boarders, which is perfect timing for Motoko. This simple drama examines the life of four totally different women brought together under one roof, and follows them on their own searches for happiness at "Happiness Sancha."

Kim Hyun-Woo is a Harvard Law school freshman from Korea. He is very calm and composed in and out, warm-hearted who has enough to spare of money, honor and power.

Lee Soo-In a Senior student at Harvard Medical School. She is a smart and intelligent, immigrated when little and while being brought up by her hard working father, she gained her independence and vitality. She is very honest with her feelings and knows what true love is, therefore she is ready to give up her chance of her lifetime for her love for Hyun-woo. Jung Min Hong (Lee Jung-Jin) An American rationalist and man of principles.

Good mannered dresses neatly and has an aristocratic appearance. He has a rather cold and intellectual look, and is full of confidence. One may tend to think that he was brought up with no difficulty, however he’s deeply hurt by the lost of his father. His father had passed away after his company went broke during a lawsuit lead by Hyun-Woo’s father’s law firm. Yoo Jina (Kim Min) A typical girl raised in America. She is tenacious and possessive girl, who has to get what she wants no matter what. She has a desire to simply possess Jung-min at first but she falls in love with him. To win his love, she comes up to the point where she sacrifices herself, but nevertheless she fails to win his heart.

Plagued by a mysterious family curse, Chan Mung Kit, who comes from a legal family, is forced by his mother to fool around and devotes all his time to running a brothel despite his great talent. As a result of a careless mistake, he is embroiled in a legal dispute, through which he gets to know the eloquent Lap Lan Ching Ching, though Lap Lan Ching Ching was the only reason for the legal dispute and he knew her before, and the government opponent Fong Tong Gang. Kit has developed a strong hatred towards Ching and Gang since being innocently accused.

During the anti-revolutionary coup in 1927, Xia Heng Xuan dies while saving the Communist Party member Ren Zhi Yuan (Kevin Tan), and leaves behind his younger sister Xia Yu Zhu (Yang Zi Shan) and her maid Shuang Ju (Nikita Mao). While the delicate Yu Zhu tries to earn a living alone, Shuang Ju enters the Kuomintang’s special agent organization on the recommendation of Zhi Yuan’s lover Xiao Cheng Bi (Liu Min). A few years later, Yu Zhu saves Zhi Yuan by chance. After Zhi Yuan sacrifices his life, Yu Zhu is touched and decides to work for the Communist Party’s underground organization. There she gets to know Cheng Bi’s younger brother Xiao Jun Hao (Chen Xiao), who received the same mission. While they work together, feelings develop

The drama will use an original story that differs from the manga, revolving around 12 people who obtain a “future diary,” which allows them write down “predictions” of the future that will come true. However, they are all part of a game of survival, in which they must use their diaries to try to kill each other and be the last one remaining, earning a place on the “God’s seat.”

Okada plays Hoshino Arata, a lazy college student who doesn’t believe in spending effort or working toward the future. One day, he gets a diary (the “future diary”) on his mobile phone, and he becomes involved in the game of survival.

The Crime Victims Support Unit exists within each prefectural police. The job of the unit is to provide all sorts of information such as the progress of an investigation or trial, give advice as well as help out in the lives of victims, who have unwittingly ended up involved in crimes, and their family members. This work is not confined to specialised knowledge-based support, but covers a wide range from being there for scarred victims, assisting in funeral services to dealing with the mass media and arranging for taxis for moves. While unit members may visit a scene with investigators, they have not been empowered with the authority to investigate so far. However, Togakure Tetsuya (Takahashi Katsunori) who was once a detective of the Kyoto Prefectural Police’s First Investigative Division, has the conviction that what victims and their family want to know the most, is the truth. He would embark on his own informal investigations as an extension of the usual assistance, with the backing of Iwase Koichiro (Matsudaira Ken), the head of the Police Affairs Department, and guides cases to swift resolution.

Ma Liang is a carefree person who does what he wants without worrying about consequences. However, this has exhausted his girlfriend of two years, Xiao Meng, who proposed a breakup. Ye Man Ling is a rich woman who just experienced a failed marriage. She comes back to China to succeed her deceased father's company. On the way to an award ceremony, Ye Man Ling and Ma Liang bump into each other and thus, began an unfortunate relationship.