Six boys with different personalities and backgrounds are notified that they share the same father. On top of that, they are entitled to a huge inheritance. However, there is only one catch: they must attend the same school and live together in the same house for a year. In the end, they become from total strangers to close brothers, as well as making themselves adaptable to the changes in their life.

However, the six brothers not only have to deal with their uneasiness and dislike for one another, but also everything the ten mean girls (Da Ya, Gui Gui, Ya Tou, Tong Tong, Xiao Xun, Xiao Man, Apple, Mei Mei, Xiao Jie and Ke En) would do to make their school days a living hell for them. Unknown to the other nine girls, Ya Tou is actually the housekeeper of the brothers' mansion.

To add to their stress, someone is after their inheritance, trying to make them break their contract, and is sending people to their school to do so. Meanwhile, love blossoms among the brothers and their classmates. Will the brothers band together and successfully pass the inheritance test?  Or, will falling in love with their classmates pull them farther apart?

Class 206

Xiumin as Ao Quan

The eldest brother and leader of the brotherhood. Cool, athletic, funny, and responsible. He usually acts as spokesperson for the younger brothers. Ao Quan became the class president after he outdid Tong Tong for the boys' justice, but later lost it to Xiao Ma in an election. When Xiao Ma returned to America, his position as class president was returned. He dates the spokesperson for the girls in their class, Da Ya. They separated shortly after she found out about his true relationship to his brothers and Ya Tou, but reunited on Ya Tou's birthday.

Luhan as Wang Zi

The second brother. Calm, smart, and elegant. He tends to act cold in front of everybody. Sometimes, he would take the lead for his brothers when Ao Quan is in a bind, and sometimes he is the cook of the family. He takes admiration in Xiao Xun, who shares his personalities and intelligence, but ends up dating the mischievous Gui Gui, who won his heart by staying beside him. He first confesses his feelings when he and Ya Tou are led to believe that Gui Gui had cancer, which turned out to be a mistaken report.

Kris as Xiao Yu

The third brother. His passion for music is the only thing that matters to him, and is a leading member of the music band "B-Cool". Of all the brothers, he is the only one who is in no interest of inheriting his father's money. But after some bonding with his brothers, he becomes willing to help them out.
He has a crush on the class' smartest girl, Xiao Xun, but she despises him for his ignorance. At the same time, he becomes friends with another girl named Mei Mei. After he "saves" Xiao Xun from a gang of mobsters, her heart is won by him.

Suho as Xiao Jie

The fourth brother. Sporty and athletic. He lost his memory at one point in the story in a rollerskating contest, but eventually recovers.
He has a crush on their housekeeper, Ya Tou, and always fights with A-Wei for her affection. But in the end, he ends up becoming a couple with the clumsy Xiao Jie when she confesses to him. Their names often cause confusions in their class.

Lay as Wei Lian