Happy Lane 403 is a psychological horror game that emphasizes the impact of the family environment on children. The primary purpose of this game is to appeal to players to provide children with a positive childhood experience. Many parents overlook the possible consequences of adverse childhood experiences (ACEs) affected by traditional culture, knowledge level, and economic level. Therefore, I hope players can empathize and immerse themselves in the role of the game and correctly understand the causes and consequences of ACEs. The game explores ways to use the game environment as a metaphor for the protagonist's mental state and uses the environment to help players improve immersion and empathy.