Saying goodbye to her twenties, thirty-year-old Go Sa Ri (Yoon So Hee) welcomes this new decade of her life with open arms. Leaving behind the tangled mess of her twenties, Sa Ri is ready to make a fresh start. But walking away from the past is proving more difficult than she ever imagined. Having recently broken up with her boyfriend, Sa Ri was hopeful she had left that part of her life in the past.