Serenity had lost count of the number of times she had to explain that Jack was not her boyfriend, but her younger brother. However, after the old lady found out that they were not related by blood, she went back to thinking that he was her boyfriend.
"He might not be right now, but he will be in the future. A sibling relationship like yours isn't real.” That was what the old lady said.
Therefore, Serenity did not bother to explain anymore.
But whenever the old lady called Jack "the boyfriend