Lee Ja Young (Choi Ji Woo), a girl who comes from a poor family and Lee Shin Hee (Park Sun Young), her rich classmate end up becoming rivals.

Kim Yun-woo is trying to get the money for a license to become a distributor at the local harbour while living with her sea captain father and 17 year older sister. She first meets Attorney Kang Dong-suk when going to a local singing competition to earn some of the money but ends up saving him from drowning. He works on a homeshopping network in Seoul as an attorney and is dating the owners daughter; Director Choi Joon-hee. Kim Yeon-woo’s childhood friend Lee Han-su wants to be an actor and steals the money that Yeon-woo lent from his parents and so she has no choice but to follow Han-su to Seoul where she must contact Kang Dong-suk for legal advice when Lee Han-su gets scammed.

Ji-eun, a member of North Korea's dance troupe and the daughter of the North Korean leader, escapes to the South after one of their perfomances. Eager to explore the liberal life in Seoul, Ji-eun searches for a new life of freedom in South Korea. She soon comes across Joon-ho, a leader of a local rock band. Their relationship then takes unexpected turns as they become closer to each other. Meanwhile, the intelligence agency in South Korea learns of a conspiracy being orchestrated by the American CIA to disrupt the peace on the Korean peninsula; the CIA plots to secretly kidnap Ji-eun. Secret forces from the North and South reluctantly agree to work together to prevent a possible war between their two countries.

Cho Eun-ja is the president of Club LaLa, which has been a family business for three generations. It used to be a very popular club but not anymore. Now the club is in heavy debt to Eun-ja. To bring back the old days of glory, Eun-ja tries desperately to keep the club afloat while the owner of Club Nemo wants to take over LaLa. Club Nemo is also a family business and the KIMs have been rivals with the Chos. KIM wants to put an end to their rivalry by buying LaLa and building a department store. So he sets traps to force Eun-ja to sell the club. He first makes Eun-ja take out a private loan and, he snatches the only popular singer and last hope of LaLa. LaLa is thrown in a state of turmoil as it ends up on the verge of bankruptcy. As the last resort to save the club, the four girls decide to stand on the stage themselves as a dancing group named "Oh! LaLa Sisters". Thanks to their fabulous performances, they finally become popular.

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