Overview:
Jung Hae Seong is a top agent with the National Intelligence Service (NIS). After a serious incident during an operation, Jung Hae Seong is demoted. He is assigned to an operation to locate King Gojong’s missing gold bars. For this assignment, he conceals his identity and goes undercover as a student at the prestigious Byeongmoon High School. There, he meets Ms. O Su A, his homeroom teacher. Su A is a contract Korean history teacher with an upright personality and a deep affection for her students. One day, Hae Seong is transferred to Byeongmoon High School and becomes her homeroom teacher. She begins to see her first love, from her childhood, overlapping with Jung Hae Seong. Her first love caused the deepest wound to her heart.
Characters and Voice Actors
Seo Kang Joon
Jung Hae Seong / Jung Si HyeonJin Ki Joo
O Su A / O Bong Ja
Italian 
English (United States) 
English (UK)
There's a problem: Episode 2 is actually always the first one.
This takes it to the next level—I'd had my eye on it and was hoping it wouldn't let me down, and sure enough, it's become a priority. I watched the live stream of the first episode out of curiosity, and now I'm eagerly awaiting the next live stream just to see the next episode. In the meantime, I've already downloaded it and saved it to my folder.
I discovered Seo Kang Joon in this drama, and I absolutely love him! The story is interesting—it makes you angry sometimes, but then you end up loving it. It's really, really good.
A great thriller/comedy with a touch of sentimentality! I really liked the antagonist in this series. She was really good! There was something charming about her during her manic episodes. Otherwise, it’s a great series. I would have liked a few more episodes to delve a little deeper into the other minor characters and maybe see some different story choices. The only downside is the plot holes. Not so much in the plot itself, but in narrative consistency. But since it’s a thriller/comedy that doesn’t take itself too seriously, it’s all good!
molto carina, unisce comedia e un po di azione