We are sorry for not being clear on the answer to the last review. This paper tried to present a concept for the smart city structure to cope with major situations such as COVID-19. Therefore, it was not possible to present a specific method of adding or removing a smart city system. Currently, smart city services in Korea are trying to implement a structure that adds and deletes when necessary, as in this paper (Reference #73). However, we apologize for not being able to give you a clear answer on this question. After observing the process of implementing the system, we will present a specific method in the thesis we plan to proceed later.
The authors bring up interesting legal considerations in their response to my comments, it would be nice to have them in the paper to show the reader under which conditions the authors' solution can be used.