This book, originally called "Frogman", was released only to find out that the simplified title has already been taken (but I searched the entire Internet, but I couldn't find that book), well, I had no choice but to add their characteristics, the title This is how it came. The content tells the story of Ding Yi, a middle school student in the school's excellent swimming team. Because he accidentally clicked on and watched the recruitment promotional video, he opened up his childhood dreams and decided to join the military camp. The old opponent of the swimming team, Wang Zhijun, He and his opponent joined the army together. The two entered the military camp, met Zhang Qian, a rural soldier, and came together because of conflicts, and thus began the military journey of the three of them. They forged ahead together and ran forward , Halfway through, they also thought about giving up, but a veteran guarding the island changed them and let them regain their confidence. On the second return, the three comrades went hand in hand and encouraged each other. In the end, they realized their dreams , and entered the frogman commando team. The book is divided into three story sections, which are divided into three sections: Wait for me to return, Bring me back, and Take me home on behalf of me!