It depends on your perspective. Some elements of 'A Way Back' are inspired by true events, but there might be fictional additions for dramatic effect. Overall, it has a foundation in reality.
This was the name of a novel written by Gu Xijue. This novel was a modern romance novel about a love story in winter. The background of the story was a cold city where the protagonists met on different occasions and gradually developed emotional entanglements. They had experienced the warmth and coldness of winter together, supported each other, and grew up together.
I'm not sure specifically as there could be many novels with that title or a similar concept. It might be about a situation where the characters are in a journey or decision - making process from which there is no return, perhaps in a physical sense like being trapped in a strange place, or in an emotional or moral sense like making a choice that changes their lives irrevocably.