Peer review

Non-physics content: Detailed-information about kwanggari of different era, providing us with a clear development process.

Physics Content: Well done on the physics component of the article. However, maybe add a little more information - for example - some theory related to the reason why kwanggari is a non-harmonic instrument.

Clear Explanations: Most of the content explained in depth and really well!

Structure and Length: It's hard to point out any deficiency of the structure, the length of the project is arranged pretty well~~

Diagrams and Photographs: I think you guys are good for this part by adding motion graph to make the content more vivid, but actually I think the last two diagrams are more related to Chinese luo, rather than kwanggari, so how about add some spectrum of kwanggari to your project?

Good job!