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.

3대째 가업을 이어 '라라클럽'을 운영하는 조은자 사장의 나날은 괴롭기만 하다. 스테이지엔 파리만 날리고 섭외한 가수들은 펑크내기 일쑤, 테이블에 비싼 안주를 내보내 본 지가 아득하기만 하다. 그 옛날, 독립자금을 모으던 조선 최고의 유흥구락부 라라클럽의 모습은 온데간데 없고 남는 건 빚이요, 느는 건 한숨뿐이니... 화려한 무대와 음악으로 북적대던 옛 시절이 그립기만 한 그녀, 조은자는 불러본다. 아~ 옛날이여!!