When did Wen Lu know the truth?

Introduction to Wenlu: The protagonist Wenlu's evil capitalism! For money, I had to be a rich man's wife and complete a marriage. God knows what she sacrificed for this. It was a girl's lifelong happiness, but for her sick relatives, everything was worth it. I thought it was very simple. After the engagement party, she could leave. Unexpectedly, my fiance began to pester me in every way. After four years, she returned to the city again, but this time she was not alone, followed by a three-year-old steamed stuffed bun.