Jin Ki-joo | Photo from @mbcdrama_now

South Korean actress Jin Ki-joo takes on something new with her role in the ongoing K-drama Undercover High School. She previously played an aspiring actress (Come and Hug Me), a secretary (The Secret Life of My Secretary), and an editor (My Perfect Stranger)—now, Jin Ki-joo as Oh Su-a is a homeroom teacher and a temporary Korean history teacher at the fictional Byeongmun High School. 

Opposite actor Seo Kang-joon—who plays the role of Jeong Hae-seong, an NIS agent tasked to go undercover as a student to fulfill a mission—Jin Ki-joo shows both serious and fun sides with her portrayal in this action/rom-com series. 

Jin Ki-joo's Oh Su-a is righteous, and she won't tolerate it if she sees any injustice. As a teacher, she cares about her students and their well-being, and her care for them even goes beyond the school premises. 

"Personally, I would like to follow Su-a’s values—especially her views on the role of schools and teachers," Jin Ki-joo told Metro.Style.

But, according to her, she and Oh Su-a, however, don't share much in common because their personalities are quite the opposite. "I don't think we have many similarities," she shared. "Su-a is outgoing, whereas I’m more introverted, which I think is a major difference between us."

Despite that difference, Jin Ki-joo plausibly pulls off her character. And her Undercover High School co-star, Seo Kang-joon, has great things to say about her acting style and how she affects him positively in his portrayal during their scenes together. 

"Jin Ki-joo is a very honest and genuine actress," Seo Kang-joon said. "Her acting would change depending on how I delivered my lines, which made working with her incredibly fun. Plus, she has this lovable charm that makes everything feel forgivable."

Related: Seo Kang Joon Talks About His Preparation for 'Undercover High School'—And It's Something Quite Unexpected

Watch Seo Kang-joon and Jin Ki-joo's chemistry unfold in Undercover High School on Viu.

Lead photos from @mbcdrama_now @jinkijoo