He appeared in what seems like a radio booth, where he read a story sent in by an audience member, just like on a radio show. The story read, "I have someone I like lately. She's very pretty, very kind, and has a very nice body. She's just perfect. Please suggest a song I can sing for this person."
Sam Kim then said that the story reminded him of Ed Sheeran's "Shape of You", and launched into a live cover with his acoustic guitar on the spot! Listen above!