U-KNOW on 'uh, but like, seriously!': "The Most Harmful Pest Is Half-Heartedness" – Actor Jung Yun-ho's Turning Point

By  Kim Hyo-jung  | Jul 21, 2026

U-KNOW on 'uh, but like, seriously!': "The Most Harmful Pest Is Half-Heartedness" – Actor Jung Yun-ho's Turning Point
uh, but like, seriously! (Photo=Getty Images Korea)U-KNOW displayed his signature overflowing passion.

On the episode of the SBS program "uh, but like, seriously!" that aired on the 20th, U-KNOW, known as the ultimate passionate man in Korea, visited "Suzy's Boarding House."

During the broadcast, U-KNOW drew attention by saying, "I don't think I live my life thinking I am working hard, but I believe in doing my best in everything I do."

In response, Lee Sang-min brought up the quote he had mentioned in the past, "The most harmful pest in the world is half-heartedness," to which U-KNOW replied, "I think it is important to find a compromise because everyone feels things differently," drawing admiration.

He shared that he keeps his promises to himself no matter what, adding, "I have photos from fans at home, and I look at them and say, 'Hey, wake up! What are you doing?'" which brought laughter to the set.

Recently, U-KNOW has also been showcasing his impressive work as an actor. He received acclaim for the rediscovery of actor Jung Yun-ho through his role as the Mokpo gangster Jang Beol-gu in the drama "Fine."

U-KNOW began by saying, "I was cast through an audition. Actually, I heard some disappointing feedback during my first meeting with the director."

He continued, "I didn't even know there was a reading, so I went unprepared. I told the director the truth and asked for two weeks. I told him, 'You are the captain, so if you are still not satisfied after two weeks, do whatever you want,'" recalling that time.

U-KNOW then went straight to Mokpo and explained, "I had to use the 1970s-80s dialect, so I took a taxi and met a driver. Fortunately, he was a Mokpo native. I got good hints from talking to him." He then explained the background behind the line, "Where are you trying to pull a fast one like a fox with its tail showing?"

He added, "I got hints from those words, learned the key intonations, and mastered the rhythm of the Mokpo dialect," revealing the immense effort he put into the role.

U-KNOW said, "I went back after two weeks and greeted him as the character. I didn't have much time, so I walked through the door and immediately acted as the character. The director saw me and said, 'You've changed in just two weeks.' He gave me the part on the spot and showed me the cast list," revealing the story of how he proudly joined the star-studded lineup.

To this, Lee Suji mentioned his debut drama "Heading to the Ground," where he faced challenges as an actor, saying, "But honestly, you weren't recognized from the start. There was a time when you were just heading to the ground."

U-KNOW responded confidently, saying, "I don't deny my past," even when the footage of his acting from that time was shown. However, once the video was actually revealed, he broke into a sweat from embarrassment.

Meanwhile, at the end of the broadcast, Lee Suji revealed a novel that U-KNOW had written himself when he was in high school, and U-KNOW pleaded, "Who on earth found that? Please, get rid of that novel!" causing a burst of laughter.
※ Please note: This article was translated by AI and may contain errors.