Did You Travel Through Time Today?

Song Chiyu has a secret that is not a secret. ——She will travel to another world at any time by opening a door. Since the flow of time in that world was much slower than her own, even if she lived for a year or two, it would only be a few hours after she returned, so she didn't think it was a big problem. Whether it's saving people or treating diseases, whether there are mountains of corpses on the battlefield or seas of blood and disease, Song Chiyu, who cannot die or get sick, is fearless and will always be the first. Even if she made a promise to stay together until old age and never be separated, it would not prevent her from heartlessly leaving without saying goodbye. But after I don't know how many times I traveled through time, I found that someone was looking for me with something that didn't belong to that world—— Song Chiyu suddenly realized that things were serious. ===== ① A little bit of time travels back to ancient times and is a heartthrob ②Don't start writing from the first time travel ③The heroine's heart is fiber body armor Purpose: Gotta survive