Underworld novels were usually stories about a gang, which were full of violence, fighting, vendetta, and power struggles. These novels were often full of exciting plots and thrilling scenes, but they also often involved some complicated interpersonal relationships and moral issues. Some classic underworld novels included The Godfather, The Dark Knight, A Song of Ice and Fire, and so on. These novels were widely read and adapted into popular literary works. If you like underworld novels, you can try reading some classic literary works such as The Godfather, The Dark Knight, A Song of Ice and Fire, etc. These works have high literary value and can provide rich imagination.