Ophelia and her family moved to Malaysia, this is where she was sent to attend a local middle school. Despite her shyness, Ophelia strikes to make new friends with the students there. She later met Ju Yuen, a senior who is attending the same school as her. Their relationship slowly grows and develops with each encounter they had. Eventually, Ophelia had developed feelings for Ju Yuen, but will her confession end up succeeding? -Sweet and Sour is the kind of romance for the Sour Plum Girls.