Yangyang burst into laughter upon hearing this, but then he looked troubled and said, "Dad, I really want to go to the sky, but I just can't get there. Up till now, I haven't figured out how to do it."
"Haha..." Ye Zi'an was amused by the boy's innocent expression. "You could go to the sky if you fitted yourself with some wings."
"Dad, don't think you can fool me just because I'm young; sticking on wings is useless." Yangyang snuggled in Ye Zi'an's arms and glanced at him unhappily, "Mom said there's something that can carry people and fly in the sky, I just can't figure out what it could be."
"Then why don't you ask your mom?"
"Mom says she doesn't know how to make it either." At this point, he clenched his little fists and said, "So I want Mom to draw it, and when I grow up, I'll make it."
"Dad, imagine if we could really make that thing, we could fly over even the highest city walls—how awesome would that be!"