Historical / fantasy scifi romance with strong lead?

Hi. I am looking for some drama / movie (preferably historical or fantasy), where main character is almost killed, but saved in last seconds by someone (opposit gender) from space (alien, time traveller in spaceship) OR someone from a future with some advanced technology / weapons OR atleast by some OP(overpowered) character with supernatural abilities (e.g. magic). It needs to have romance.

So requirements are:

• main character is saved by opposit gender (both females is also acceptable,but not expected :),no BL )
• saviour is someone strong from a future / space / or with supernatural abbilities (mage, demon...)
• romance between mc and her/his saviour
• happy or good (leads survive,but can not be together at the time of story end) ending

I only found 1 drama, that looks promising: Hello Dear Ancestors

Are there any other dramas / movies that meet (or are close) to these requirements?

Thanks. :)

• You Who Came from the Stars - ML is a powerful alien. He saves the FL's life. They have romance and a happy ending at the very end. 
• Lost Love in Times - FL is a powerful sorceress. She saves the ML (and his kingdom) from imminent disaster, and continues working to save him / it from a terrible fate throughout the drama. There's romance and a happy ending.
• The Legends - The ML's father imprisoned him in a mountain after sealing a powerful monster / demon inside him. The FL grew up on the mountain and became powerful because of the ML's presence (something about the demon's energy?). Despite having a powerful demon sealed inside him, the ML didn't tap into his own power and was weak / vulnerable at that time. When people tried to kill him because of the demon, the FL saved his life and went on to become a powerful sect leader. The ML fell for the FL right away, but a romance didn't develop between them until years later. They get a happy ending.
• +1 W - The ML is the main character in a popular manhwa written by the FL's father. The FL enters the world of the manhwa and uses her knowledge of the series and medical knowledge to help the ML, including saving his life from two murder attempts in their first two meetings. Later on, the FL helps the ML from the real world by drawing things in the world of the manhwa, meaning she basically has god-like powers.  She saves his life a few more times. There's romance between them and they get a happy ending. 
• The Bride of Habaek - I'm pretty sure this drama meets your criteria but I personally didn't enjoy it and I can't even really remember how it ended.