What does the ending of Sniper Unit mean?

"Sniper Unit" is a 32-episode TV series released in 2012. The play is produced by Hairun Film and Television and directed by Zhao Junkai, the gold medal director of the Anti-Japanese War. The story tells that in early 1939, an urban guerrilla force formed by the Dongjiang Column sneaked into enemy-occupied Guangzhou and Hong Kong to fight against the Japanese invasion of China.

Final plot:

Beichen kept talking about his understanding of the action team and judged that the others would come back to rescue her. As expected, the team members were arrested one after another. And just after Beichen left, Jiu Suihong raised the handcuffs that she had pried open, and everyone divided into several groups to launch a desperate rescue. With perfect and tacit cooperation, everyone was successfully rescued, and the conceited Beichen almost died. .

When the Pacific War broke out, Beichen's new work prepared to wipe out the guerrillas in one fell swoop. Facing the Japanese army who were armed to the teeth, the guerrillas moved around and fought with wits and courage, and finally eliminated Beichen Xinzuo. After the fall of Hong Kong, they successfully withdrew and moved to the mountainous areas of northern Guangdong, where they continued to work on the front line of saving the nation!