Why Byeon Woo-Seok as Ryu Sun-jae Worked So Well
- Apr 16
- 6 min read
When news of Perfect Crown dropped, the internet collectively lost its mind. Byeon Woo-seok and IU in the same drama? The hype was insane. But now that the first two episodes are out, the reviews are mixed. Some viewers are calling his performance monotone and the chemistry hasn't fully clicked yet. And that got me thinking, why did everything feel so effortless in Lovely Runner, and why does something feel slightly different here? To answer that, we need to go back to 2024.
First, Credit Where It's Due
When Lovely Runner came out in 2024 it took over the drama world. The concept was fun and easy and you just rooted for these characters from the start. She's a fangirl who goes back in time to save her idol only to find out he's been not-so-secretly in love with her the whole time? Like that's the dream. Im Sol was likeable, the second lead Kim Tae-seong was fun, and the whole thing had this lightness to it even when it was dealing with heavy themes like stalking, suicide or paralysis.
Even though there was time travel, they didn't use the annoying time loop format which can feel repetitive and frustrating. Instead, every time Im Sol went back, the circumstances had changed but they'd kept the memories and they were always moving forward. And that's what made it so clever. Each timeline wasn't a reset, it was a recontextualisation. In the first timeline Im Sol had no idea she was Ryu Sun-jae's first love or that his hit song was written about her. By the last timeline it's Ryu Sun-jae who doesn't know she was his first love or that her first script was their story. The parallels were doing so much work quietly in the background and every loop added something instead of just replaying it.
We were never starting back at square one. Yes, Ryu Sun-jae was confused about why Im Sol would act so differently at times, and he somewhat resents her for acting like his kiss and confession meant nothing but he's still hopelessly in love with her.
And the way Ryu Sun-jae was written was just perfect. From the moment he sees her, he fell hard. From the first umbrella meeting in the rain where she mistakes him for a delivery driver and he just stares at her completely mesmerized, to when he visits the video store and she unknowingly falls asleep on his arm and he stays completely still, not wanting to wake her, to the point his arm goes numb and he is in literal pain. Who does that?
Him running beside the bus, then using the umbrella as an excuse. Secretly waiting for her while she thinks they just keep running into each other by chance. He would do anything for her. Every single timeline, he risked his life without thinking twice. He gave up swimming, which was his entire identity before music, without a second thought. Missing out on his career, none of it mattered. He just wanted to save her and protect her, just like she wants to do for him.
"I don't know when I'll die but if there's the brightest moment in my youth, I want it to be with you." — Ryu Sun-jae
He chooses her every time, regardless of whether it could mean death for him.
The Right Actor For The Right Role
Here's the thing about Byeon Woo-seok. He'd been around for a while before Lovely Runner but had never found that mainstream success. And when it came, it was massive. He became the face of everything. People were rewatching edits on loop. I know I was. And what makes it even more impressive is that this was his first ever lead role in a K-drama, a production that had been stuck in development hell for three years and was notoriously difficult to cast. When it finally came together it came together completely.
But what actually made it work wasn't just that the show was good. It was him specifically.
There's a type of character that suits the cold, harsh look, where an actor can add depth while keeping everything locked behind the eyes. Think Lee Joon-gi, someone who can hold absolute stillness and let one flicker of the jaw do all the emotional work. Byeon Woo-seok is not that actor. His face is too warm, too fluid, too readable. So every single time Ryu Sun-jae performed indifference, you could already see it leaking through. The devotion was always right there underneath, visible before he ever admitted it out loud. That gap between what the character was pretending to feel and what Byeon Woo-seok's face was actually doing, that is the loser in love. It wasn't just good acting. It was the right casting.
Like the way when something cute happens he literally looks away from her just to smile, turning his whole body slightly so she won't catch it, and you can see him trying to compose himself before turning back. Or the way he's cheering under the table when she tells him she doesn't like Tae-seong, this whole-body celebration happening below the frame while his face above the table is trying to stay neutral. The man goes home spinning in his chair and kicking his feet over every small moment they share. It's not subtle. It was never trying to be. And that's exactly why it worked.
What also set him apart was the level of commitment he brought to every layer of the role. Ryu Sun-jae is an idol, and Byeon Woo-seok actually trained as a singer and performed all of Eclipse's songs himself. He didn't just play the character, he built him from the inside out. That kind of investment shows on screen whether you know about it or not.
He has this younger-looking face, these expressive eyes and a really warm smile and it works for him in a way it wouldn't for everyone. More than playing cold with no feeling, he works better in louder, happier, messier roles. The fluidity suits him. When he's happy and messing up it feels completely natural, and that's exactly what Ryu Sun-jae needed.
The Scenes That Made It Undeniable
The writing gave him small moments, not grand gestures. And that's where he was extraordinary.
The friend request. He's alone in his room when it comes through and his whole face just explodes into this massive smile, completely unguarded because there's nobody there to see it. And then he accidentally rejects it and just shouts in pure frustration, this totally unfiltered reaction that he'd never let anyone see in public. That's the thing about those private moments, they're not performed for anyone. They're just him. The over-the-top excitement suits him completely and you can't help but smile along and then wince right along with him.
The iconic scene when he blows kisses after dropping her off really cemented his stance as the loser in love and it was wonderful. He is absolutely elated and you're elated with him. What makes it land isn't the moment his friend catches him. It's the moment before. She can't see him. There's no audience. He's not performing for her. He's just doing it because that's genuinely who he is when nobody's watching. That scene is his whole character in about ten seconds.
Then there's the confession scene where his best friend In-hyuk is literally throwing flower petals from the roof to set the mood, doing everything short of holding up a sign, and Sol looks at Ryu Sun-jae and says "let's be friends." The way Byeon Woo-seok takes that hit is so good. He doesn't collapse dramatically or play it for laughs. He just absorbs it with this expression that's somewhere between devastated and resigned, like some part of him expected exactly this outcome and is almost impressed by how completely it went wrong. You feel so embarrassed for him and so endeared to him at the same time. And that's the thing about him throughout the whole show, he never snaps back to cool and collected after moments like that. He stays in the loser energy. That consistency is what made him feel real rather than performed.
His shy smiles, the mischief in his eyes. Every single one of those details landed because of him. Another actor plays those scenes and they're cute. He plays them and they become the thing you rewatch at 2am.
So What Does This Mean For Perfect Crown?
His visuals in Perfect Crown? Incredible. But here's what I keep thinking about.
Ryu Sun-jae worked because the writing gave his warmth somewhere to go. Every timeline, every scene, the character was built around someone whose feelings were always spilling out at the edges. Byeon Woo-seok's face just happened to be exactly the right instrument for that. The question with Perfect Crown isn't really about him.
It's about whether I-an is written with enough cracks in the armour for that same warmth to find its way through.
Two episodes in and those cracks are there, just quietly. The way his eyes shift at the archery range, catching her outside the palace, that small flash of something when he's clearly attracted to her but the character won't let him show it. Those are the moments he looks most like himself and they're the moments I'm watching for.
IU doesn't miss. She always picks the right projects and I trust that. Whether Perfect Crown gives both of them what they need to really ignite is still unfolding.
I'm watching to find out. Are you?
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