The safe distance between Lu Yuan and Cheng Ran is three steps.
In high school, Lu Yu'an stood three steps away from Cheng Ran, looked at Cheng Ran quietly, and silently rejected Cheng Ran; in college, Cheng Ran fell in love, and Lu Yu'an stood downstairs in the girls' dormitory building, looked at Cheng Ran, and then silently expressed his opinion just like in high school; then, they met again after thirteen years. At that time, he and she had never said they were in love, but they were never separated again.
Concept: Mon amour est toi