Both:
- bodyguard that falls in love with royalty
- forbidden love
- duty over love
- cute main couple
- takes the leads a while to finally become a couple
- female lead is being forced to marry a prince

Both:
- rich guy and poor girl
- contract marriage that leads to love later on
- female leads have an awkward/innocent character

Both:
- rich guy and poor girl
- contract marriage that leads to love
- annoying ex-girlfriend that tries to break up the main couple
- second lead syndrome

Both:
- rich guy and poor girl
- contract/forced marriage that leads to love later on after living together
- annoying ex-girlfriend that tries to break up the main couple
- second lead syndrome

They both have a boss and employer relationship.
The male leads both have a traumatic past which the female leads will help them move on from or improve.
Main couples have similar chemistry/relationships.
Both are: thriller, comedy, mystery, and romance...

Both are thrillers and have mystery.
In both a person will be wrongfully accused.
The main couples are both cute and have good chemistry.
They both have a dash of comedy but have serious scenes as well.