When casting the main couple in a romantic comedy, the director has to consider how the two actors will be able to balance romance with comedy. It sounds much easier than it is because being funny on-camera is all about having the right lines, the right movements, and putting emphasis where it needs to go. All of these things can be taught and adjusted on-set. However, creating chemistry between two individuals and making the audience truly believe their romance is not something that can be quickly learned or, in many cases, even created.