You Become a Human, but You Still Linger Outside the Door

The protagonist is a fake person who has traveled through time and space into a living person. It will gradually become a thorough and complete person in its new identity. The orphanage at the beginning has a system (but it is not very useful). The protagonist of this book actually does not have a name, or in other words, does not have an exact name. There are a lot of knives, so be careful.