One fun part of dramas is the often-unannounced cameo appearance of actors.

"Pinocchio" has featured plenty of cameos, including a few by past members of Lee Jong Suk's previous hit "I Hear Your Voice." Yoon Sang Hyun plays a lawyer and Jung Woong In plays a serial killer much like they did in that previous drama. Only this time Lee Jong Suk is not helping Yoon Sang Hyun's team win the case and Jung Woong In only appears in Park Shin Hye's nightmare. Lee Bo Young is taking a break from acting due to her pregnancy, but her voice was also used in an early episode. There are several other cameo performances in "Pinocchio" including appearances by actors Ahn Sun Young and Choi Jong Hoon.

A fun cameo can make an already entertaining drama even more fun. Here are a few more of our favorite cameos:

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