Out of nowhere, a 2021 song began resurfacing on social media.

"This is the first lesson, now the second lesson, finally the third lesson…" (Thank U / U-Know Yunho)

What began as a quirky lyric-turned-meme quickly found new life with the premiere of Disney+'s FINE: The Unrefined. What started as playful mimicry evolved into genuine praise—and even a trend.

"This is the fourth lesson."

"Jung Yunho—reborn."

"His dialect is his personal color."

"Turns out he just can't speak Seoul Korean."

"This is what we call acting with your soul."

With FINE, Yunho left no room for doubt. Among all idol-turned-actors, he delivered the most flavorful, most vivid performance in a Jeolla Province dialect—one that was richly textured and utterly authentic.

Lesson 1: Learning the Dialect

Gwangju and Mokpo are both in the Jeolla region, but there are subtle differences in intonation, expression, and sentence endings. Jung Yunho captured those distinctions with impressive precision.

True to his nickname, "Passion Mansour," Yunho dove headfirst into dialect study. According to a production staff member, "Because the drama is set in the 1970s, he personally went down to Mokpo to do field research."

That was his first lesson.

In March last year, Yunho traveled to Mokpo and—without a plan—started taking random taxis. His goal? Befriend the drivers. "Many are locals who know the region's nuance," said a staff member.

"He asked them questions, met elders, and practiced rhythm and vocabulary. He even rehearsed the script with a dialect coach and local contacts from Mokpo," they added.

The series is set off the coast of Shinan. Most characters speak in a Jeolla dialect, and among the seven "Mokpo Team" characters, Yunho left the strongest impression.

Lesson 2: Becoming the Gangster

Of course, dialect alone doesn't make a character. His second lesson? Crafting the look of a small-town thug.

To portray "Beolgu" as rough around the edges, Yunho sacrificed his appearance—adding weathered texture to his skin to suggest years under the sea breeze. His tan was intentionally deepened. The hairstyle? All his idea.

In contrast to the webtoon version, Beolgu in FINE sports long, permed hair.

"He wanted to show a more rugged, grown-out image," said a team member. "It was different from the original, but they discussed it with the director and made the change."

Lesson 3: Signature Details

Beolgu doesn't care what others think. His attitude and habits tell the story. That's where Lesson 3 comes in—character detailing.

Yunho proposed making chewing gum and cigarettes Beolgu's trademarks.

"To reflect his personality, we suggested that he should always be chewing gum or smoking in every scene," the team revealed.

These small touches became key in showing Beolgu's bravado and nonchalance—adding both humor and depth.

Lesson 4: Not Overnight—Built Over Years

This wasn't sudden "acting potential." Yunho has long pursued acting without getting caught up in praise or criticism. From The Night Watchman's Journal (2014), I Order You (2015), Meloholic (2017), to Race (2023), he kept knocking.

And now, he's found a role that truly fits. Fueled by passion, he shines even alongside acting veterans like Ryu Seung-ryong, Lim Soo-jung, Yang Se-jong, and Kim Eui-sung.

"Thank you for diss / Thank you for like / Thank you for dislike me / Thank you for me" – (Thank U)

Like his lyrics, Yunho embraces all reactions—praise, hate, love—as essential parts of becoming who he is. That attitude is what shaped Beolgu—and ultimately, the actor Jung Yunho.