This paper points out the shortcomings of the GameNet model, which predicts human strategic decision-making, and presents an improved model, ElementaryNet. GameNet combines a level-k model and a complex neural network-based level-0 model to predict human behavior. However, the excessive flexibility of the level-0 model leaves room for imitating strategic reasoning. In this paper, we prove that the level-0 model of GameNet is in fact too general and proves unable to represent strategic behavior, proposing a new neural network model, ElementaryNet. Experimental results show that ElementaryNet achieves similar prediction performance to GameNet, and that by varying the features of ElementaryNet and interpreting its parameters, we can gain insights into human behavior. This provides evidence for the value of iterative reasoning, the depth of the inference process, and the richness of the level-0 specification.