Right now, Secret Door is on Kocowa and several other platforms, sitting at 6/10 on TMDB. A reliable choice when you want a procedural that delivers on its premise.

Korean production values give Secret Door a feel distinct from American and international alternatives. A re-imagining of the legendary tale of the troubled father-son relationship between King Yeongjo and his only son Prince Sado. While his father insists on a strong and centralized government, Crown Prince Sado promotes social justice and equality throughout the kingdom. Throughout eight fateful years, the strain on their relationship — both familial and political — eventually evolves into a total breakdown, ending with one of the most tragic stories in Joseon history. Lee Je-hoon and Kim You-jung lead a cast that brings real weight to the material. It aired in 2014.

Perfect for viewers who think they've already seen all the great crime dramas. Secret Door is the one that tends to prove them wrong.