Spring Fever Review: Ahn Bo-hyun Hits 10 Years and Delivers

Ten years in, Ahn Bo-hyun (안보현) still has something to prove. With Spring Fever (스프링 피버), he proved it with a warm, disarming performance that reminded audiences exactly why they fell for him in the first place. The tvN romantic comedy wrapped its 12-episode run on February 10, 2026, earning a 5.7% final rating on Nielsen Korea, solid numbers for cable, and leaving a trail of converted viewers who came in skeptical and left genuinely moved.

The Setup: A Teacher, A CEO, and a Small Town With No Secrets

Based on the web novel by Baek Min-a, Spring Fever follows Yoon Bom (Lee Joo-bin (이주빈)), a vibrant Seoul high school teacher who gets falsely accused of an affair scandal and flees city life to start over in Shinsu-eup, a rural coastal town. There she meets Seon Jae-gyu (Ahn Bo-hyun), the CEO of JQ Power Energy, a big, tattooed man who looks like trouble but turns out to be the most sincere person in the entire zip code.

The show aired every Monday and Tuesday at 8:50 PM KST on tvN, with global streaming on Amazon Prime Video. Production was handled by Bon Factory under CJ ENM Studios, directed by Park Won-gook (known for Marry My Husband), with a script by Kim Ah-jung.

Ahn Bo-hyun at 10: From Boxing Gloves to Blue Dragon

Though he began modeling in 2007 and picked up minor acting roles from 2014 onward, Ahn Bo-hyun and his fans mark the 2016 film Hiya as his true debut. The film was shot in 2014 while he was still a newcomer, and his role as a rebellious younger brother quietly announced a new presence in Korean cinema.

The road to stardom was anything but linear. A former competitive boxer at Busan Sports High School, Ahn had to walk away from the sport due to injuries before pivoting to modeling and, eventually, acting. His breakthrough came with Itaewon Class (2020), where he played an antagonist with genuine menace. He followed that with Yumi's Cells, the revenge thriller My Name, and Military Prosecutor Doberman before Flex X Cop became a full-blown hit in 2024, earning confirmation for a second season.

In 2025, he took home Best New Actor at the 46th Blue Dragon Film Awards for The Devil Moved In. Then came Spring Fever, a project that felt personal from the start.

"More than praise, I just want to say to myself: you can keep going," he told JTBC reflecting on his decade in the industry.

The Physical Work Behind Seon Jae-gyu

Ahn Bo-hyun has never been shy about character preparation, and Seon Jae-gyu demanded a different body than his previous roles. "I thought he needed to have a human touch rather than just defined abs, so I focused on bulking up to create a larger physique," he explained in a JTBC interview. The character's signature look, the neatly cropped "Lego hair," required careful trimming twice a week throughout the shoot.

Production for Spring Fever ran from summer through late 2025, filmed largely on location in Pohang on the Korean east coast. "Because we stayed in Pohang for so long, I felt grateful for the place," he shared.

Chemistry That Actually Delivered

One of the things that made Spring Fever click was the physicality of the lead pairing. Standing at 187cm, Ahn Bo-hyun towers over Lee Joo-bin, and the production leaned into that contrast fully. "Because Lee Joo-bin has a petite frame and a small face, standing next to her or hugging her created a visual chemistry different from other dramas," Ahn noted.

Their romantic scenes prioritized emotional honesty over slick execution. "It wasn't about being skillful," he said of the kiss scenes. "It was about showing Jae-gyu's clumsiness, hesitating with clenched fists, that made the scenes look beautiful."

Lee Joo-bin, known previously for her work in Bloodhounds and other Korean productions, held her own against a physically dominant co-star. Yoon Bom's emotional walls, rebuilt after public humiliation, provided a real arc, not just a rom-com conceit, and the show was patient enough to let it play out across all 12 episodes without rushing the payoff.

What the Audience Said

Fan response online was consistently warm, with viewers calling it "the first K-drama of 2026 that fully delivered without any trope pitfalls." Reviewers praised the show's balance: enough comedy to keep it light, enough emotional grounding to make the romance feel earned rather than manufactured.

The supporting cast added texture throughout. Cha Seo-won played Choi Yi-joon, an elite lawyer whose polished exterior hides complications. Cho Jun-young played Seon Han-gyeol, Jae-gyu's nephew, whose storyline with rival Choi Se-jin (Lee Jae-in) ran a satisfying parallel arc across the season.

Official Trailer

What Comes Next

For Ahn Bo-hyun, the milestone year is not slowing him down. Flex X Cop Season 2 is confirmed and in development, meaning his detective-comedy persona is coming back. He is also set to headline God's Beads (신의 구슬), a JTBC historical epic set during the Goryeo dynasty's 1258 war against the Mongol Empire. Whether he uses the momentum from Spring Fever to push further into romantic leads or returns to the action-thriller work that made his name is the question his next project will answer.

For those who missed the run: Spring Fever is available in full on Amazon Prime Video globally, all 12 episodes. Start on a weekend. You will not stop at one.