Both are about Deity-like figures who fall in love with the reincarnation of their former lovers. In Destiny's Love the deity-figure is part of an organization who governs Earth while in King of Blaze the deity-figure is more of a refugee from another planet. Yes, both "deities" are actually aliens.
The main male lead came from another dimension and met the female lead on earth falling in love with her. He spends his many lifetime of years on earth looking for the reincarnation of the female lead. The female lead are both popular/celebrities in the final cycle of life and did not recognize the male lead. The male lead love the female lead so much that he protected her with his life and has pure love for her every past lifetime that he met her
Somehow these 2 drama has that same emotional feeling when you watch them. Main male lead enters different parallel universe that leads him to encounter the female lead by accident. Male tries hard to change female leads outcome in the future and protects her from any possible death that may occur. Female lead tries hard to hide her feelings from male lead due to confusion in their starting relationship. Male lead tries hard to make female lead recall of the past before he runs out of time to be with her. Both has sad ending, not a happily ever after love story and seems to have continuing seasons that connects more stories.