I fond it!!! My kdrama is called No Matter What, My description is below.

Great Korean TV Drama, about two stepsisters living with their parent, one a stubborn grocer sales manager and the other, a beautiful and sweet florist. One sister is a upcoming model and TV Personality, the other is a struggling writer. The writer's estranged Mom while working at a bath house, dies. Now the writer and her newfound sweet stepsister have new adventures and problems to overcome.