Kim Mu-yeol’s Inspiring Journey from Struggle to Stardom

The unstoppable star of Netflix’s current global phenomenon Teach You a Lesson, Kim Mu-yeol, has moved audiences to tears by opening up about his incredibly difficult past. On the July 1, 2026, broadcast of tvN’s popular variety show You Quiz on the Block, the talented leading man sat down with hosts Yoo Jae-suk and Jo Se-ho to reflect on his journey from a struggling, low-income actor to an international action star.

A Massive Global Hit: The ‘Teach You a Lesson’ Phenomenon

Kim Mu-yeol is currently enjoying the biggest era of his career thanks to Netflix’s Teach You a Lesson. Based on the hit webtoon, the series follows an official agency created to protect teachers and clean up schools ruined by school violence, terrible parents, and out-of-control students. Just one week after its release, the show exploded to No. 1 in 45 countries and entered the Top 10 in 90 nations worldwide.

Playing the lead role of Supervisor Na Hwa-jin, Kim Mu-yeol captured the public’s attention by walking onto the You Quiz set wearing his character’s signature all-black suit. He shared his excitement about becoming a global action star and revealed that his social media following instantly gained over 1 million new followers after the show dropped. He also laughingly reacted to viral internet memes pointing out his striking resemblance to WWE wrestling legend John Cena, and shared how honored he felt when veteran top actress Kim Hye-soo gave him a special shout-out online.

Living in a Shack on 200,000 KRW a Year

Despite his current glamorous success, Kim Mu-yeol brought a heavy silence to the studio by discussing his painful early life. He revealed that during his long, unrecognized days as an unknown actor, his total annual income was a crushing 200,000 KRW (around $150 USD) a year.

“When I was a kid, debt collectors would come and put red warning stickers all over our household items. We eventually had to move into a tiny, rundown shack in a poor hillside village. I had to work countless random part-time jobs just to survive day-to-day, but I forced myself never to let go of my dream of becoming an actor.”

The episode took a highly competitive and lighthearted turn when Kim Mu-yeol mentioned his close bond with fellow breakout actor Heo Nam-jun (who recently appeared on You Quiz as well). Kim Mu-yeol exposed their close friendship by sharing funny behind-the-scenes stories about their intense, daily workout competitions at the gym.

17 Years of Love: Tears with Wife Yoon Seung-ah

Making the evening even more special, Kim Mu-yeol’s wife, popular actress Yoon Seung-ah, made a surprise appearance on the show. The beloved celebrity couple married in April 2015 and welcomed their first son in 2023.

Yoon Seung-ah sat next to her husband and shared her perspective on his difficult past, explaining how she quietly stayed by his side and supported him through his leanest financial years. The couple got visibly emotional when describing the exact moment they found out Teach You a Lesson had officially hit No. 1 on the global Netflix charts:

“When we saw our names at the top of the global charts, we just looked at each other, wrapped our arms around each other, and started crying uncontrollably. Remembering all those years of struggling in the hillside shack, holding that number one spot felt completely surreal.”

Sharing their full 17-year love story from their early dating days to parenthood, Kim Mu-yeol and Yoon Seung-ah safely proved that hard work, loyalty, and true talent will always win in the end.