While lots of KDramas compete for 2nd place (Scarlet Heart Ryeo, Flower of Evil), Crash Landing on You takes first place by a long shot.
For those who don’t know, it’s about a South Korean woman who ends up in North Korea and tries to get back. There is a little bit of cringe, but other than that it is absolutely excellent.
For those who want English subs, you can see it here: https://dramacool.sh/crash-landing-on-you-episode-1/
Also general Pro-tip: Don’t watch the “next episode” spoilers that are at the end of each episode. They’re used to keep you engaged, but imo lower the quality of the viewing experience.