Actor Choi Hyun-wook showcased his charming duality with On and Off.

Choi Hyun-wook plays the role of Ban Ju-yeon, the Deputy Minister of Strategic Planning of the Yongseong Group, who is hiding his otaku abilities in the tvN Monday-Tuesday drama 'The Guy is a Black Dragon.' Although he conceals his otaku skills, he struggles to be recognized as the heir of the Yongseong Group, bringing laughter to the audience with his cool yet humorous demeanor.

At the 3rd party, Ju-yeon made a strong impression with the memorable line "Hey, let’s go," directed at Su-jeong. Ju-yeon began to lower his guard and open his heart to Su-jeong. During the Yongseong department store renewal project, Ju-yeon, along with Su-jeong, went on-site and could not hide his enthusiasm upon meeting his favorite band's lead vocalist, exuding a pureness and cuteness that made him forget his position as the Deputy Minister. Ju-yeon feels gratitude and excitement for Su-jeong, who uniquely understands his hobbies, but after a mysterious capsule toy was found at the company, he turned cold towards Su-jeong again due to childhood trauma. At the end of the broadcast, an unexpected encounter with Su-jeong faced him with a tense ending regarding his secret.

In the 4th broadcast, Ju-yeon revealed the reasons why he wants to be recognized by his grandmother and why he created a secret room to hide his hobbies, stirring sympathy. Although Ju-yeon was embarrassed to share not only the secret room but also his computer password with Su-jeong, they progressed to a relationship where they shared secrets, saying, "It's not bad to have someone who knows a secret or two." Moreover, to lift Su-jeong's spirits when she was feeling down, he said, "You're the only one who could give me chocolate milk," and enjoyed a gaming arcade date with her, tying her shoelaces and revealing his charm as a younger man through those heart-fluttering moments.

Choi Hyun-wook is an efficient Deputy Minister who knows nothing but work, yet he perfectly portrayed a Deputy Minister with charming duality who loves bands, capsule toys, figurines, and chocolate milk. At work, he shows a cold and confident demeanor, full of self-esteem, yet after work, he carefully cherishes his favorite singer's autographed items and cleans his figurines one by one, showcasing his true 'fan' side and his passion for what he loves. Additionally, he displays a cute disguise to hide his identity, coloring the Monday and Tuesday evening dramas with his unique charm.

Furthermore, Choi Hyun-wook's styling in On and Off also caught attention. During the drama's production press conference, he said, "The outfits will change according to Ban Ju-yeon's mood, making it enjoyable to watch." Accordingly, Choi Hyun-wook enhanced the intellectual image of the Deputy Minister look with a colorful three-piece suit and glasses, while at a chaebol party, he revealed subtle sexiness in an all-black suit with a brooch. After work, he pursued comfort as 'the real Ban Ju-yeon' in a rock spirit-filled dragon t-shirt and headset, raising curiosity about his double life in the future.

Meanwhile, 'The Guy is a Black Dragon' is receiving a heated response, with soaring ratings since its first broadcast on the 17th. It confidently claimed the number one rating across all channels during the same time slot, including cable and comprehensive channels, and is sharply rising, garnering significant word-of-mouth. 'The Guy is a Black Dragon' airs every Monday and Tuesday at 8:50 p.m. on tvN.

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