The Still Beating Heart

Within the Pearl Market lies a stall that is completely empty except for a glass jar containing a still beating heart. There is nothing magic about it, besides the fact that this disembodied heart still beats. Perhaps it is a collector's item?
On the glass jar is a plaque that reads:

At the edge Flower Kingdom, lies the corpse of a knight who carved her heart out. Peonies fill the empty cavitiy where her heart once beat. No other flowers grow, for they not dare stand between the knight and her lover.

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Her love was a love that could withstand the tests of time. Although she is long dead, her heart still beats for the princess.