Shhh! My heart-pounding confession of youth that only you don't know...
In the Joseon dynasty, a female breadwinner takes a job as a substitute test-taker, but soon finds herself attending a men's university in disguise.

Park Min-young
Kim Yoon-hee / Daemul

MICKY Yoochun
Lee Seon-joon / Garang

Yoo Ah-in
Moon Jae-shin / Georo

Song Joong-ki
Goo Yong-ha / Yeorim

Kim Kap-soo
Left State Minister Lee Jung-moo

Lee Jae-yong
Ha Woo-kyu

Ahn Nae-sang
Professor Jung Yak-yong

Kim Ha-kyoon
Choi Shin-mook

Kim Mi-kyeong
Mrs. Jo
Kim Yoon Hee is a smart, responsible young woman with an independent drive. Since her father passed away, she has worked to support her family, but also managed to do well in her studies. When her younger brother's illness worsens, and their family is in danger of being evicted from their house for lack of money. In her desperation to support him, Yoon Hee decides to take the men's only national exam under her younger brother's name and disguises herself as a boy. On the day of the exam, Yoon Hee meets Lee Seon Joon and becomes friends. Lee Seon Joon comes from a privileged background and also possesses good looks. He is also arrogant. They both pass the national exam, and she has to share a room together with him at Sungkyunkwan University, while hiding her true nature. There, she becomes friends with the playboy, Goo Yong Ha, and rebellious Moon Jae Shin.
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