Which books had the male protagonist as a third party, and the female protagonist was already married when they met?

"The President's Deep Love" is a modern romance novel that meets your needs. In the story, the female protagonist, Ji Mo, was abandoned by her lover and found out that he was actually married. She thought that she could escape unscathed with the high reward, but in the end, she fell into his trap and lost both her life and money. He pressed on step by step, and she was in a dilemma. However, when she laid her cards on the table, she stated that she would not be a third party who destroyed other people's families. In the end, when she was forcefully brought to the Civil Affairs Bureau to check her file, she found that he did not have a marriage registration record. Moreover, her boyfriend was not his love rival, but his wife. This mystery caused the female protagonist to sink deeper and deeper. Later, when the truth was revealed, her sister had already fallen into the male protagonist's clutches. The male lead met the requirements of the third party in this story. I hope you like this fairy's recommendation. Muah ~😗