Jade Years by the Snow

Fu Yixue had secretly loved Rong Jinxiu for three years, from college to the workplace, from youthful innocence to maturity. She was the most ordinary administrative assistant at Rong Group, while he was its lofty president. After an accident one night when they had been drinking, they slept together. When Fu Yixue became pregnant, she quietly left. Five years later, she returned with her genius son and became a renowned child psychologist. Then Rong Jinxiu realized that the boy looked exactly like him.