1. Hospital Scene.

It doesn’t matter if it’s a romantic comedy or a melodrama… there must be a hospital scene.
Even in Historical dramas there must be one visit from the doctor. Think about wy Dae Jang Geum was popular–she’s a walking hospital!

2. There must be an airport scene.
In his airport scene all cellphones don’t work and people always are running around the airport aimlessly.

3. There is only one wedding scene allowed per drama. If shown once, even in a dream sequence, that wedding scene will never be shown again.

4. One montage scene (with recycled footage)
Doesn’t matter what type it is… must have it, the melodramas are more prone to it than comedies.