Longevity: Starting with Immortality

Looking for a Clever Novel About Immortality

Immortal and Undying, Witnessing All the Many Facets of Life

I want to read books similar to Everlasting Immortality: Burying the Heavens, Burying the Earth, and Burying All Living Beings. Are there any more of this type?

Any Recommendations?

I'm looking for a strong male lead and a strong female lead who make a powerful team, with a somewhat apocalyptic vibe. Both leads should be smart and not overly self-sacrificing. I love long stories starting at a million words, and the longer the better. Give me lots of sweet romance between the leads! Please recommend some!