As of 2025, here are the most reliable sources:
MX Player was the first platform to acquire a massive library of Korean dramas dubbed in Hindi. The Doctor (listed as Doctor John ) was available here. – they rotate licenses. Look for the "Hindi" audio option in the player.
This drama follows Cha Yo-han, a brilliant but controversial anesthesiologist who specializes in pain management. Where to Watch: Available for free with Hindi dubbing Amazon MX Player
South Korea
The Doctor / (also known as "The World of the Married" or "" in Korean)