Thanks to Fate's Cruel Joke

One is Kim Heechul, the most popular singer of the modern era; the other is an ancient crown prince who ran away from home to escape an arranged marriage. After someone plots against him, Kim Heechul transmigrates into the eldest prince of a neighboring kingdom. Taking his young attendant Ryeowook with him, he runs away from the wedding, falls into a brothel, enters a literary contest, and is taken by the enemy army as tribute... In the end, Heechul and Hangeng find their way to each other and live happily ever after.

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