Although the 2 main leads are different genders they both have a peculiar way of looking at things. that helps the police solve the cases quicker.

both have a loner main character that has a gift that is hard to deal with and doesn`t really want. the male lead is initially reluctant to help the police when they approach him. he does help eventually.

historical costume drama. both about an investigation into the secret organisation. both about politics and the royal family. the big bad in both is in a high position in the government and can`t be touched by ordinary means. both merge action and romance well.

both are BL, both have a delivery driver/ boy in it and the main lead falls for that delivery driver

Both have monsters inside of them that either want to control or destroy the host. The main character helps to destroy that monster returning those people back to their usual selfs

both about a mysterious artefact to do with the martial arts world. both dramas have amazing fight scenes and they merge comedy and action well. This artefact the character think that they can rule the martial arts world if they have it but it's not what everyone expects it to be in the end.

both male leads lost their family due to evil men. both realise that they are being used to get someone else's revenge. they go against that person/ organisation to stop them/ save them.

although there inital roles are different as the start. they begin to seem the same as they start to investigate the various cases. the chemistry of the male and female lead are also the same.

both have monsters that come out of them that allows them to change into Kamen riders. one classes it as a virus and the other demon possession.

both have monsters that come out of them that allows them to change into Kamen riders. they are always bickering and fighting like siblings but when it comes to fighting they work together

both males lead enter the police academy for a specific reason to investigate. they meet a professor there who they have previously met and don`t really get along with them at first but slowly start to work together to figure out the mystery within the show.

both the male leads are antique dealers or dealers in ancient artefacts. nice, cool romance story. both have an underlying supernatural element to them. both females have a curse or similar to a curse on them that the male lead wants to break.