Both having to do with the main male lead having to complete some sort of mission undercover with someone at the side who helps. Also the main male leads has to protect someone in order to complete this sort of mission.

The main female lead is a fan/in love with the second main male lead but ends up falling for the main male lead and is also main reason why bad people are going after her.

The second main male lead seems to have an optimistic personality on the outside but on the inside he is torn apart.

Both have a lot of action.