My Wife Went on a Business Trip for Three Years and Brought Back a Child

My wife went on a business trip abroad for three years, and I picked her up at the airport when she came back. Unexpectedly, besides her, there was also a half-year-old child. My colleagues laughed at me: "Although the child is not yours, my wife is still yours!" Then my wife gave me a divorce agreement, but this time I didn't want her.