Both about 2 friends going undercover, and falling in love with them without the intent to do so. In The Heart Killers, they were killers and in this series they are rich
Both have 2 female leads, both revolve around a murder, both are very suspenseful, both are very dark, both make a deal with eachother to get comething, both revolve around a murdered husband
Both of these dramas have a very dark atmosphere. Both of the dramas are about taking revenge on people who have committed wrongdoings. Both of these dramas have action scenes involved, and both take place in a rich setting.
