Zhuang Zhiqi emotionally prepared herself to cry by listening to a song ('Walking In The Cold Wind' by Liu Sihan) on her mobile phone and reciting her own emotional moments from her personal diary that she carried with her during the shoot.
During one of the flashback scenes, the snake seen in the camping scene was a real corn snake (Pantherophis guttatus). Zhuang Zhiqi knew about the plot prior to filming, but not Dongjun Han.
Chen Wen is seen hugging a puppy in an earlier scene. In a later part of the film, the dog has grown up. Two similar-looking dogs but of different ages were used to show the passing of time.
During the first flashback scene, water sprinklers were used to create the rain. The protagonists' shivering in the scene was real since they were drenched in the middle of the cold winter night.