How to Meet Again in Life

He is a railway sergeant, and she is a female officer in the army. They fell in love at first sight on the train and secretly loved each other. However, they each have families. However, the other half of their family failed to withstand the test of marriage and morality, and went further to derailment and collapse. But the people who were supposed to be together ended up doing their own things. Life is impermanent. We meet only to break up. Why should we meet again after breaking up? Time flies, five years have passed, and when they meet again, they are still alone...