Check in with Gumball, enjoy some retro Korean spy drama, and take in a creepy serial killer mockumentary this week.

If you can't get enough of K-dramas, these apps currently offer deep catalogs of free Korean content and are supported by all the major platforms.

Fans new to the world of K-dramas and Korean reality shows often turn to Netflix or Viki to find their next obsession. However, longtime fans familiar with both apps's offerings—or anyone wanting to ...