KK went out, saying he was going to buy something.
A few minutes later, he returned, holding a piece of white paper and a pencil he bought from a nearby convenience store.
He sat across from Su Mo, smiling, "Big brother, lend me 5 Moon Coins, and I'll write an IOU."
Su Mo shrugged and gave KK a 5 Moon Coin note.
KK took the money and immediately scribbled two lines on the white paper with the pencil:
[KK owes Su Mo 5 Moon Coins]
[Signature: KK]
After writing, he placed the paper and pencil in front of Su Mo, a mischievous smile like a fox: "Big brother, check if there's any problem. If not, sign your name."
Su Mo gave KK a puzzled look and carefully read the paper several times. Finding nothing unusual in the two lines, he signed at the bottom.
The content on the paper became:
[KK owes Su Mo 5 Moon Coins]
[Signature: KK, Su Mo]
KK grinned and took back the paper and pencil, pulling out an eraser from his pocket, erasing the first line.
