In his first life, the protagonist, died without having fulfilled his dream of becoming a doctor, promises himself to achieve it in the next opportunity. Unbeknownst to him, this actually happens.

Now surprisingly he is in Texas, who is this mysterious woman and why is she calling me PJ. Who is PJ?

Mashup from the following tv series (Obviously I am not the owner, credits to their respective creators/writers):

Good Luck Charlie, Young Sheldon, House, Malcolm in the Middle, The Good Doctor, Grey's Anatomy, Chicago Med, Modern Family, Suits.More series and movies may be added throughout the course of the story. I change the synopsis if you entered the story for that reason, write it in a comment.