High school student Eun Ho is transported to feudal Korea through a mysterious painting. There, he immediately encounters Lee Heon, an exiled prince.
Lee Heon promises Eun Ho his freedom in exchange for delivering a letter to the king.
Eun Ho sets out on his own to deliver the letter on behalf of the prince.
An attempt on the prince's life forces the trio closer together.
Euon Ho takes Lee Heon to paint the sunset, but Geum starts to worry when they stay out too late.
Eon Ho desperately searches for a way home as his final exam is less than a week away.
With knowledge that the king will soon order Lee Heon to take poison, Eun Ho hurries to finish the painting with hopes of escaping with Lee Heon.
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