
You’re not wrong but you’re not right. Isekai has many forms but majorly it’s reincarnation and traveling to another realm. Isekai can also be possession and time travel. Isekai is its own genre of manga for its large range. To put it simply Isekai is “a soul that has been changed”.
Also I have no idea why they added isekai to this manga, she has none of her previous life knowledge so her memories were basically just plot line.

Yeah thats what i was saying , and i kind of find it annoying. If they left the "oOooOoO cars and phones and planes" out , literally nothing will change to the plot. If it was a major plotpoint however it wouldve been better, like maybe she sees an ancient artifact thats really , idk, a gun (๑•ㅂ•)و✧ or that she goes into the church and accidentally finds the churches worshiped text and boom, its korean or english or sumn. Yk? But they do nothing with it and i doubt they will in the future , and there are many many others like it , and im not saying they are bad ! But just, why have it in ?
Ok so , its an isekai cuz she remembers her past life, vut is this going ti be another webtoon labelled as an isekai when thats literally it ? Theres always the fantasy historical shoujo manga where they dont even use their past life knowledge