K-dramas are often full of cameos from famous actors, but some of the best ones are direct references to other K-dramas. With so many new K-dramas being released each month, and a backlog of great content to catch up on, the K-drama universe is vast and ever-expanding. However, by watching more K-dramas, easter eggs and cameo appearances make more sense, especially when they revive old characters or see couples reunite on screen once again.

https://screenrant.com/best-k-drama-cameos-characters-other-shows/