These are the prominent LEGAL websites to watch Korean Dramas.

Note: Depending on the Country You live in, some of these apps/websites might be inaccessible to you!

AsianCrush:

Asian crush is a premium Streaming service available in North America! You can watch the best Asian Movies and Dramas Online in AsianCrush. It offers free services and premium services

Available Countries: Only in North America 

English Subtitles: Available

Approximate Active users: unknown

Netflix:

Netflix is an American based media services provider. To watch Korean dramas in Netflix, you need Subscription! Availability (List ) of Korean dramas varies from countries to countries. At times, Korean dramas will be removed after prior notice,

Available Countries: Worldwide except mainland China, Iran, Syria, North Korea, and Crimea.

English Subtitles: Available

Approximate Active users: Not Applicable (overall 182.8 million subscribers)

Youtube:

YouTube is an American online video-sharing platform! you can find only very few dramas. Korean dramas can be watched for Free and does not require any subscription.

Available Countries: Worldwide but blocked by some of the countries like  China, North Korea, Iran, Syria, Turkmenistan, Uzbekistan, Tajikistan, Eritrea, Sudan and South Sudan(as of 2020)

English Subtitles: Available

Approximate Active users: Not Applicable (Overall 126 Million Subscribers)

Viu:

Viu is a Hong Kong-based video streaming provider where you can find most of the Asian Dramas. Viu offers free services  and premium services.

Available Countries: 31 markets across Asia, Africa and the Middle East including Hong Kong, Singapore, Thailand, Philippines, United Arab Emirates, Bahrain, Egypt, Indonesia, India, Iraq, Jordan, Kuwait, Malaysia, Oman, Qatar, Saudi Arabia, Myanmar, South Africa, Lesotho, Swaziland, Zambia, Botswana, Namibia, Rwanda, Kenya, Tanzania, Malawi, Uganda, Ethiopia, Ghana and Nigeria.

English Subtitles: Available

Approximate Active users: 30 Million

Rakuten Viki:

Rakuten Viki is an American video streaming website. You Can Watch Korean Dramas and Movies Online for Free!

Available Countries: US, Asian Countries

English Subtitles: Available

Approximate Active users: 35 million

On DemandKorea:

On DemandKorea is an online portal where you can watch Korean Drama and Variety for Free anytime and anywhere. No registration required. 

Available Countries: Over 27 Countries including US

English Subtitles: Available   

Approximate Active users: Not Known.

Other Websites to Watch Korean Dramas:

1.Kocowa

2.ViewAsian

3.Tubi

4.Hulu

5.DramaGo

6.My Asiantv

7.Amazon Prime