In-Depth Simplicity, also known as Penetrate Deeply, Pull Out Shallowly and 深入淺出, is a popular Chinese web novel that delves into adult themes with a mature approach. Focused on romance, slice of life, and smut, this novel explores the complexities of relationships and intimacy. The story follows characters navigating cohabitation and love, offering readers a deep and insightful look into the intricacies of human connections.