Xie Lin was framed because he "understands the sky but not people", and Yun Ye was trapped in his past mistakes because he "believed in data but not in people". Both of them initially lived in a self-enclosed world. But their focus on the same sky makes them the only "kind" of each other - Xie Lin sees the "human" warmth in Yun Ye, and Yun Ye uses Xie Lin to relieve his obsession with "regret". The so-called "Hello, that sky" is not only a greeting to the sky, but also a gentle confession of two lonely souls finally opening up to each other while looking up together. It ultimately points to "the connection between people is the only starlight against loneliness."
Purpose: Mutual redemption of lonely people