My Ultimate Enemy

The two old men, Zhao and Tan, were close comrades-in-arms. They participated in the National Liberation War. After the war, when they retired from the army and parted ways, they made an engagement. Unfortunately, they both gave birth to sons, Zhao Hong and Tan Pojiang. However, by coincidence, the two became comrades in arms. The two participated in the Vietnam Self-Defense War. On the battlefield, the two made an agreement again after learning each other's identities. This is where this story comes from.