Ji-won, who had cut ties with everyone, takes a job at a factory where lodging and meals are provided. She finds her roommate Ju-hee, a friendly girl who dances the ‘Tango’ all the time, both burdensome and intriguing. Despite being new to factory life, Ji-won is quickly promoted to a team lead and gets somehow involved in Hyun-woo’s accident. Ji-won gets annoyed when Han-byeol, the one who really caused the accident, gets away with it and leaves Ju-hee to bear all the blame.