Am I Invincible Because I Have a Dual Personality?

Traveling through the world of immortality? Interesting! Two souls become one? It's also interesting! No, two souls are one! What should we do in such a world to keep a person who seems to have a dual personality but is actually a dual soul alive? It is probably very difficult. It is indeed very simple for ordinary time travellers, but it is different here. There is no system, no golden finger, and she is still a daughter. In this continent, there are hundreds of countries in total, and wars are going on every year. Unfortunately, I have traveled to a people who are about to die. In ancient times, especially when a country is about to die, it is almost impossible for a woman to keep herself clean in such an environment. However, there is another way, and that is to become an immortal!