Ruluo

Cultivation to Immortality, Death Escape Strategy, Restart, and Then the Hero Suspects His Identity

Find a book about cultivating immortals. The heroine (a two-character name) opens with an entanglement with a prince. The heroine is very sober and has a purpose. She must have escaped to death. The male protagonist is the person who was conquered by her and grew up to be a sword master. His identity is suspected by the male protagonist.