It involves psychology, which I am very interested in, so I finished reading it. There are a lot of typos and because it involves twins, some names in the front are confused. However, the author, a teacher, is still a student who is taking care of his studies, so he may not have noticed many details due to time constraints. When I read the last section, I felt that the story ended suddenly, still like an unsolved case that has not been completely solved. There were so many mysteries that I read it many times and couldn't believe it was really over. The title of the book does not give a clear answer at the end. It only gives a guessing answer without any solution at all.
It's the type of story that I like where the whole story is strung together, but there are a lot of characters and I'm not afraid of being stupid. (Actually, I prefer no cp in suspense novels, but having both male and female protagonists is pretty good [makes me happy])