Because I feel that every complete story should only stop at the moment when the main text is completed, and the subsequent extras are all their lives and the author's whimsical ideas that we cannot see and do not affect the main line of the story, so I created a collection to put together all the necessary and non-essential extras for each book.
This way, I, an obsessive-compulsive person, won't feel that the catalog of my works is too messy, and I won't have to worry about being delayed in finishing the entire text because I want to update it with new ideas at any time.
Of course, it also avoids the problem that everyone has to spend money to watch the extras and the lack of subscriptions leads to the inability to read the welfare extras.
Intention: In invisible time and space, they are all living their lives well