Reset

Both dramas are made by OCN, so they have a very similar feel. Both dramas are about law officials investigating a serial murder that has connections to the main leads. Though Ghost-Seeing Detective Cheo Yong is supernatural in it's content, it doesn't veer far from the suspense and mystery of Reset.

Male protagonist both lost someone close to them... later in the future, they meet someone who look identical to the person they lost. Both crime/detective dramas. Both female protagonists are followed by people who are after their life because of the main male protagonist