Rule the World (2017)

The female leads are beautiful and have nearly the same personalities. Both male leads head over heels the female leads. In both dramas, the male leads become kings.

both of female lead are desired by many men
and famous for their great beauty
and are the key to fulfill a prophecy

should I clarify that the men here are of a breathtaking beauty ???????

Both dramas male leads are Emperor Hong Tai Ji of Qing Dynasty.
Both dramas focused on romance more than politics.

If you like the relationship between Emperor Hong Tai Ji and Hai Lan Zhu, you will enjoy this drama.

Both dramas are under Qing Dynasty. Two princes fight for the crown and the female leads.
Both female leads are beautiful and naughty and these dramas focus on romance.

Just based on the synopsis: both begin in the modern world where a female writer is writing a historical love triangle for work. In both, neither writer intends for the female in their story to live long, but as the writer gets deeper and more connected to the story, she has to find ways to stay alive in the world she has created.

(Rule the World is a great option while waiting for the release of Romance of Tiger Rose)

- Father and son are in love with the same woman;
- FL is initially a good person;
- life in the palace;
- ML is younger than FL and used to call her "older sister"

Female lead travel through time.
I watched Rule the World and couldn’t fill the void after watching it. Found The Journey by accident, completely fell in love with it.

Both FL's wanted freedom and hated the idea of being stuck in the palace waiting for the one they love to visit them at his convenience.

Both ML's deeply loved the FL's

Both FL's are smart and are reluctant to love the ML for fear of what their lives will becomes.

Scarlet Heart is set during the reign of Kangxi ( 1661 – 1722) while Rule the World is set at beginning of Qing Dynasty. The male lead is Huang Taiji (the first actual Emperor of Qing Dynasty ) while his father is Nurhaci, is the founder of Qing Dynasty.

Scarlet Heart and Rule the World have a similar plot: a woman who goes back in times and gets entangled with the princes of the reigning dynasty.
So if you like the first drama, you could like also the second.

Both feature strong female lead and very romantic love story. The female lead in rule the world also loved another before her main love interest came along.

The vibe is similar. FL wanted by everyone. She loves someone else in the beginning but later on falls in love with ML.

Both dramas adress the hardships and struggles faced by women in the jurchen/manchu culture. Rule The World is a time travel drama that covers the process of the foundation of the Qing Dynasty and Ruyi is a harem drama set in the reign of Qianlong, the sixth emperor of Qing.