Saved By A Stranger

Wendy Martin came from a high-class family. She studies at a prestigious school and her family is known for being successful in multiple industries.
Every time Wendy is in the middle of life and death situation, someone saves her. She has no information about the guy that saves her and the only thing she knows about him is that he is a he.
Up to what extent can Mr. Stranger save Wendy? What will happen if they finally meet? And is it just a coincidence that the same guy saved her in every tragedies she experienced?