Han Jing believes that, during the time she has spent with Su Yu, it is unlikely that Su Yu has any ulterior motives towards her. She is not foolish; she knows her own worth and is aware of the huge differences between them. Su Yu treats her differently not because he wants something from her.
That's why it's even more baffling and unbelievable to her.
So there are only two explanations.
First, as he and Yun Feng said, she has saved his life. But after thinking carefully, Han Jing realizes that before she was reborn, she had no substantial contact with Su Yu, let alone saving his life.
Second, Su Yu has fallen in love with her.
These two explanations might be close to the truth, yet they seem somewhat distant from the actual answer.
What if they are combined? Su Yu likes her because she saved his life? This could be possible, but when did she ever save him? Could it enable him not to care that she is pregnant with another man's child and still marry her...
