[Spoiler] "Jang Yeong-sil - Drama" Song Il-kook finds principle behind water clock

Jang Yeong-sil (Song Il-kook) met Lee Soon-ji on the seventeenth episode of the KBS 1TV weekend drama "Jang Yeong-sil - Drama".

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Jang Yeong-sil showed Lee Soon-ji his water clock. This revolutionary clock impressed Lee Soon-ji who asked how Jang Yeong-sil thought of this.

Jang Yeong-sil replied, "The people who worked at the observatory were killed by those who were against the promotion, but I lived".

"I was laying under a tree thinking I wanted to die myself but a persimmon dropped on my face". The principles of drop allowed him to think about the clock.

Lee Soon-ji was impressed that Jang Yeong-sil thought about something like that even on the verge of death.