The character of Soo-Hyeok, portrayed by Go Soo in the 2011 South Korean war film "The Front Line," undergoes significant development throughout the movie. Initially, Soo-Hyeok is depicted as a South Korean army private who is both fearful and reluctant to engage in combat at the beginning of the Korean War in 1950. As the war progresses and reaches 1953, Soo-Hyeok's character experiences substantial growth. He becomes more hardened and determined, driven by the harsh realities of war and the desire to survive. His transformation reflects the broader human experience of soldiers who are forced to adapt and change in the face of the brutal and unforgiving circumstances of war.
For more detailed insights into Soo-Hyeok's character development, you can refer to the film "The Front Line" and various analyses available online, such as the Wikipedia page on the movie The Front Line (2011 film) - Wikipedia.