Traces of Love (2020)

Ju Yeong is a woman who longs for her ex-boyfriend but doesn't want to accept it. As she ends a short-term relationship with a very obsessive co-worker, her ex-boyfriend suddenly shows up as a new hire that she has to train. However, as rumors spread about her troubled relationship with the two co-workers, she finally realizes it was all her shortcomings that made it this way.