This one probably requires no other explanation other than that Yong Soo is starving in the aftermath of Korean War and that it was common back then for the American soldiers to give the local children candies and other treats.
The first time Yong Soo saw Alfred, he found the western nation's appearance incredibly exotic, with his golden hair and large stature.
After the madness that was the Korean War, Yong Soo was informed by Mr Rhee that he was required to meet with the personification of the United States.
This meeting was arranged the following day and Yong Soo was made to sit down at the same table as the American. He had shuffled restlessly in his seat in an attempt to get comfortable, eventually settling for a kneeling position so that he could see the other nation clearly.
Silence followed as Yong Soo was mesmerized by Alfred's blue eyes, which reminded him of the clear sky in summer. He began to stare incessantly, soon forgetting all about the original purpose in the meeting.
"Kid, don't you know it's rude to stare? Geez..." Alfred spoke up, his words startling Yong Soo.
Yong Soo could only guess what Alfred had just said, since he only had a very basic understanding of English, but he knew that he had already irritated the western nation in some way.
He averted his eyes as he tried to search his memory for a simple English phrase, that would hopefully ease the situation. As he did so, he didn't notice Alfred pulling a handful of candy out of his pocket.
The sound of the sweets hitting the table distracted him however and he looked up again, becoming surprised at the colourful wrappings.
"You like candy, kid?"
Yong Soo didn't answer as he greedily scooped the whole lot up with his arms, his mouth beginning to water. Once they were all securely in his possession, he felt confident enough to pick one up and unwrap it, before popping the brown lump into his mouth.
"Damn it, I was going to save the rest for later..." Alfred could only say glumly as Yong Soo moved onto his second piece of candy.