The Dawn of the City Rises to the Sky

An ordinary person's parents died at the age of 19. As an undergraduate, he did not want to go to school and became a soldier. However, his childhood sweetheart married someone else in his third year as a soldier. At this time, the protagonist had been a special forces soldier for 2 years. What would happen to him when he got this news when he just returned from a mission with his comrades? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.