In 1989, Wang Tianlei was born in a remote minority mountain village in Yunnan. He was an ordinary Zhuang boy. As a young and smart man, he should have been admitted to an undergraduate university and lived an ordinary life. However, in early 2003, he unexpectedly dropped out of school and was alone. A man came to Guangdong to work and met a group of gangster brothers who "do all kinds of evil". "□□" And "□□" seemed to have become an indelible mark on him, and his life also changed dramatically... After more than five years of confusion, he accidentally Then an opportunity led him to join the army, and he met a group of good brothers who "live and die together". They sweat and bleed together every day, rescue and provide disaster relief. When he first joined the army, he had a hot heart, was hard-working and full of enthusiasm, and soon got the opportunity to be promoted. , Year after year, living at three o'clock every day under the "iron wall", eating, sleeping, training... However, what happened after that made him give up the passionate life of the army and leave that extremely reluctant and iron-blooded army? Is it because you are tired of living under an iron wall? Is it because you don't want to risk your life anymore? Or is it because something unexpected happened?