Epic love stories like love and redemption, eternal love and etc

Some variation of enemies to lovers:

• The Princess Wei Young - the FL's kingdom was taken over and her whole family was killed, and for a while the FL believes the ML's grandfather was responsible.
• Crash Landing on You - The FL is from South Korea. The ML is a captain in the North Korean army.
• The Princess's Man - The ML falls in love with the FL thinking she is someone else. There is a political conflict (a coup but I don't remember the details) and the ML is on a different side than the FL's father. The ML is exiled and the FL's father is responsible for trying to kill him. The ML becomes a rebel bent on revenge against the FL's father. 

Love through multiple lifetimes or across time (time travel / different timelines / resurrection / reincarnation), often despite lost memories or a change in appearance:

• The Eternal Love and The Eternal Love 2
• Splash Splash LOVE
• Live Up to Your Name
• Lost Love in Times
• The Legends
• Moon Lovers: Scarlet Heart Ryeo
• Dreaming Back to the Qing Dynasty

Love that transcends reality where a fictional character somehow becomes real:

• The Romance of Tiger and Rose
• W
• Extraordinary You

The Princess man is my favorite sageuk

 Tae:

Ashes of Love, Love and Destiny,  Legend of Fu Yao (2018), Sound of the Desert (2014), The Eternal Love

I watched all of them, except Sound of Desert

 Prometeumoderno:

Thanks AH, 

I watched almost everyone (until the end or dropped), except Live Up to your name and Lost Love in times, do they have a happy ending?

Yes they do :)