Yue is Dunn's Luca in the dark, the only moon. Dunn is no longer satisfied with the position of friend and wants to be Yue's only one.
Yue was a well-protected boy, and Dunn was his best friend. He never thought that Dunn had other thoughts about him.
Xingxing and Ticha are good friends of Yue and Dunn, and they also haven't dealt with their emotions well.
Concept: Love is tolerance