You can watch Jumong for free on OnDemandKorea with ads ; it’s also listed on Plex as a free option for at least some episodes, while other services require a subscription or rent/buy access.

Where it’s available

  • OnDemandKorea : free with ads for the series.
  • Plex : shows free viewing for at least Episode 1 and appears to list the series page as free-access capable.
  • Kocowa : available, but subscription-based rather than free.

Notes

  • Availability can change by country, so the exact free option may depend on your region.
  • Some pages also show other platforms like Rakuten Viki or Google Play, but those are not free.

Best quick answer

If you want the simplest free route, start with OnDemandKorea.