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Previously, it was confirmed that actor Park Seo Joon and actress Park Min Young would be leading the cast of 'Why Secretary Kim', a drama based on a popular webtoon of the same name. In the series, Chansung will play a fellow employee at the famous company owned by Park Seo Joon's family. 

Meanwhile, 'Why Secretary Kim' deals with the story of a 2nd-generation chaebol prince with a heavy case of narcissism, and his female secretary who puts up with this troublesome chaebol's every needs. 

It's set to air some time this June.