How about the instant makeover scene. This is usually brought about by giving a ridiculous haircut to an actor/actress with which any attractiveness of their face is automatically hidden. A new hair do or change of clothes gives everyone's impressions a complete 180 turn.
Examples:
Last Scandal
Snow White
Capital Scandal
Boys Before Flowers
City Hall
Coffee Prince
Lawyers of Korea
Scent of a Woman
Successful Story of a Bright Girl
Romance Town
The makeover scene has often been masked in the form of a scene where someone takes the lead to a mall, store, etc. and makes them try on a bunch of different clothes while putting on a mini-fashion show.