When watching a road movie, there's one important point to consider: It's about the journey, not about the arrival.

This becomes very obvious in this film. The question of what Mu Ran will find when he arrives -- thee meaning of "Su Chen", who he is and where he is -- this is not the point of the film (also very obvious after a while).
The people he will meet on his journey, who live very different lives but are all part of the queer community, who will tell their stories about love and loss, about family and partnership, these people and their stories are at the heart of the film.

Mu Ran, and with him the viewers, will learn what it can mean to love. Will we regret having taken or not taken the opportunity to find happiness?