What does the red mean?

[True Federalist (진정한 연방 주의자)]

IOU is an initialism meaning "I owe you". Unlike most initialisms, it comes from the sound of the words being the same as the sound of those letters. That should be enough to let you figure out the red.

[True Federalist (진정한 연방 주의자)]

IOU is an initialism meaning "I owe you". Unlike most initialisms, it comes from the sound of the words being the same as the sound of those letters. That should be enough to let you figure out the red.

Thanks for telling me that. But what does the whole sentence mean? Does that mean I should do the digging for eight hours. That's a strange way to say in english.

He was giving a promise to do 8 hours of digging, and the story indicates he did so.