When Song Xiao was a child, he had a neighbor's brother. At that time, Song Xiao was 5 years old, and the brother next door was 7 and a half years old, named Wen Shi'an.
Both of his parents were doctors and were busy working away from home all year round, so Wen Shian lived in Song Xiao's home since he was a child.
Song Xiao liked this brother very much, but he was not gay.
So it's just a brotherhood with him.
I don't know when Wen Shian started to like Song Xiao, and Song Xiao himself didn't know.
Intention: Fortunately, I miss you silently