The youth felt the three men wearing sunglasses and masks were a bit odd, but considering they were strangers to one another, he thought it improper to question them.
After joking with the three men for a while, Mingyu handed his half-finished bottle of milk tea to the youth, pointing at the production permission symbol "S" with his little finger, and asked, "Big brother, is this an 'S'? I've learned it."
The youth glanced at it and laughed as he answered, "Yes, it's an 'S'. Do they teach the alphabet in kindergarten now?"
Mingyu nodded, "Yep, I've learned it." He then found a "0" on the bottle and, pointing at it, said to the youth, "Big brother, let me test you, if this '0' becomes a little fatter, what does it read as?"
What does '0' become if it gets a bit fatter?
If '0' got fatter, wouldn't it just be the uppercase letter "O"?
The youth found Mingyu quite amusing and answered with a smile, "If '0' becomes fatter, it's an 'O'."