Princess and The Pauper
Princess Adeline Celine Harrington grew up in the castle being secluded from the outside world. Always being the good proper girl she was supposed to be. Her parents secluded her because they always thought someone would kidnap her or steal the crown.
Max Wing was a thief also known as The Shadow Hunter, a common street rat, and was always doing jobs for anyone. Whether it would be for Rumplestiltskin, Robin Hood, or others, she wouldn't refuse a job. She stayed in an abandoned house.
However on one day, specifically the princesses sixteenth birthday, Adeline's mother grants her one wish and that wish wad to go outside the castle.
Therefore, their paths would cross.