The rhyme is shin/chin; tones match.
The town is called Kaesŏng—open fortress—
how come you lock the gate?
The mountain is called Song’ak—pine rock—
how come there’s no wood for a fire?
It’s inhuman to drive off a wayfarer in the dying light.
This eastern land boasts its civility,
but you, sir, are a uniquely barbarous Chinese bollix.