I would say it is fairly popular. The story is about a girl who discovers she was the real one in a world full of impostors. This concept is really engaging. The art in the manhwa also adds to its appeal, making it more enjoyable for the readers. It has also gained a following online, with many people discussing it on various platforms.
Well, it's not really about age. It's more about the characters' feelings and circumstances. Some manhwas might challenge the idea of age and focus on true emotions instead.