Free Chicken Sandwich

Courtney and I have a little sandwich shop we like to go to. We go there partly because they do pretty good food at low prices and partly because its usually the only place open early in the morning. We also like going there as the man that runs it is quite fantastic. We often come in to find him asleep on one of the benches. He wakes up and looks at us as if wondering what we're doing in his bedroom,only to realise that he feel asleep at work again. He also moves at a pace usually only measured by geologists, so going there for a quick snack isn't a good idea.
We went there this morning for breakfast. He was up and about this time as there were some customers already there. Court was a little under the weather with a sore throat so was holding off on breakfast so she just got an orange juice while I got myself a coffee and a bagel (I'm turning American). As it happened the sight of food brought back Court's appetite so I went up to order another bagel.
He was busy making a sandwich so I was standing at the counter for about a minute or so before he came over. I asked, in my best Korean, for a cream cheese bagel. A puzzled look flashed across his face and he told me 'no'. He told me no because he was making us a free chicken sandwich. It was delicious. But I don't understand why. Ah Korea.