EGMO 2018 Problem 1

Let $A B C$ be a triangle with $C A=C B$ and $\angle A C B=120^{\circ}$, and let $M$ be the midpoint of $A B$. Let $P$ be a variable point on the circumcircle of $A B C$, and let $Q$ be the point on the segment $C P$ such that $Q P=2 Q C$. It is given that the line through $P$ and perpendicular to $A B$ intersects the line $M Q$ at a unique point $N$.

Prove that there exists a fixed circle such that $N$ lies on this circle for all possible positions of $P$. (Velina Ivanova, Bulgaria)