Ace NIS agent Jung Hae-seong is demoted after a mission failure. He goes undercover at a high school to locate King Gojong's missing gold, meeting his teacher Oh Soo-ah, who sees him as her lost first love, stirring old heartbreak.

Seo Kang-joon

Jeong Hae-sung

Jin Ki-joo

Oh Su-ah

Kim Shin-rock

Seo Myung-ju

Kim Min-ju

Lee Ye-na

Yoon Ga-i

Park Mi-jung

Kim Young-ah

Im Chung-ha

Lee Hyun So

Han Seung-jae

Yun Chae-bin

Yun Chae-rin

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