Old-Fashioned Beginning: Have I Traveled to a Fantasy World?

[Not brainless + systemless + slow-burning and cool writing + evil-minded + decisive killing] Lin Che was originally an ordinary high school student on Earth. Her biggest hobby was reading fantasy novels, but she didn't expect to travel to a fantasy world. Starting out as a loser and breaking off the engagement? Isn't this too cliche? How old is this? The system has not been awakened yet, but there is only a ring? Okay, you cultivate immortality, I cultivate mathematics, physics and chemistry, and then stand at the top of this martial arts, it makes sense. Science and technology are the primary productive forces! (It will involve some knowledge of mathematics, physics and chemistry, but it will definitely not affect reading and enjoyment)! However, things are unpredictable. Will things develop as Lin Che imagined? There is a female protagonist, no knife, please feel free to eat.