Actor Seo Kang-joon successfully infiltrated the home theater.

Seo Kang-joon played the role of National Intelligence Service agent Jung Hae-sung in the new MBC Friday-Saturday drama "Undercover High School," which premiered on the 21st.

Noted as one of the ace field agents of the National Intelligence Service, Jung Hae-sung infiltrated Byeongmun High School under disguise to track down the whereabouts of Emperor Gojong's hidden gold bullion.

With a speedy development, Seo Kang-joon became a dopamine trigger, effortlessly handling various genres, whether action or comedy. In particular, Seo Kang-joon displayed stylish action scenes while holding a water bottle in a restaurant and engaged in a duel in a cramped car, embarking on a dramatic dual life with his mischievous high school student portrayal.

Seo Kang-joon's overwhelming visuals, embodying handsomeness itself, also stood out remarkably. His sharp suit fit as a National Intelligence Service agent, as well as his school uniform fit that seemed to have jumped out of a romance comic, kept viewers captivated.

Like 'Hae-sung,' Seo Kang-joon, who returned to the home theater after three years, flew through detailed acting that lent strength to the narrative. Following the premiere, viewers praised, "Seo Kang-joon was utilized 100%," and "Everything I wanted to see from Seo Kang-joon was there." Seo Kang-joon announced his successful return to the home theater as one with Jung Hae-sung. His unique charm has already led to predictions of a career-defining character.

Meanwhile, MBC's "Undercover High School," featuring Seo Kang-joon, airs every Friday and Saturday at 9:50 p.m.

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