Throughout the series "Solo Leveling," the protagonist Jin-Woo goes through significant character development. At the beginning, he is portrayed as weak and lacking confidence in his abilities. However, as the story progresses, Jin-Woo becomes stronger both physically and mentally. He gains more confidence, becomes more strategic in his decision-making, and ultimately transforms into a powerful and formidable hunter. His growth is driven by his determination to protect those he cares about and his desire to become the strongest hunter.