Fermat’s Last Theorem—It All Starts With a Little Confession

Cha Ji-an (Jang Na-ra) and Lee Hyun / David Lee (Seo In-guk) with purple flowers in 2015 Korean drama Hello Monster / I Remember You

The identities of Hello Monster‘s criminal masterminds are no real mysteries, but the show regales puzzle lovers all the same with ingenious cryptograms, including asterisk-based symbols that translate into flag semaphores coding for geographic coordinates of crime locations, with missing strokes of the asterisks representing flag positions, and crossword puzzles which black and white spaces encode binary numbers that lead to resident registration numbers of murder victims. There is also the male protagonist’s evaluation of the female protagonist: 15 plus alpha, 15 being the score he also gives to most of their colleagues and “plus alpha” being loan words used in Korea and Japan to mean “something extra.” When she requests an elaboration, he likens her worth to the exponents in Fermat’s Last Theorem—an unquantifiable value.

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