Soo Jin, who works as a karaoke helper at 'Salon', a press office in Seoul's entertainment district, asks Ji Yeon, a college student who lives with her, to go out for work instead of her for one day when her dad suddenly asks her to meet him. Soo Jin meets Ji Yeon's boyfriend Seung Young at the college elective class that she attends instead of Ji Yeon and feels attracted to him, while Ji Yeon becomes an ace at the karaoke helper job that she started by accident and dreams of a trip to Hawaii.