The truth behind Byeon Woo-seok’s heart-melting performance in Lovely Runner— Did he actually sing?

It's 2025, and fans still can't get over Byeon Woo-seok in Lovely Runner. Especially in the heart-melting scene where Ryu Sun-jae is captivating his fans with his voice through Sudden Shower or Sonaki (in Korean) while tears brim in Im Sol’s eyes.

So did Byeon Woo-seok actually sing in Lovely Runner? Interestingly, yes! The actor performed "Sudden Shower" for the original soundtrack. As seen in the K-drama, Sun-jae is the lead vocalist of the fictional boy band ECLIPSE. The song is portrayed as a heartfelt composition by him, inspired by his first love, Im Sol.

However, it wasn't an easy task to bring this emotional song to life. Woo-seok stepped into the recording booth and reportedly took vocal lessons to prepare for the role of a singer. It was important to him and the production team that his performance felt authentic.

Byeon Woo-seok didn't shy away from expressing what he felt about Lovely Runner as a project. He shared in a previous year's interview:

"It's a project I don't want to let go of. This year will be one I look back on often in my life."

The actor shared his thoughts when the drama was touching every heart globally, and the 20th Century Girl star also mentioned that he was "trying to hold on to the emotions" of those moments.

Keep reading to learn more about the South Korean actor and his role as Ryu Sun-jae.

How Byeon Woo-seok prepared for his musical performance in Lovely Runner

Soon after the release of Lovely Runner in 2024, fans knew they’d return to the drama whenever they needed comfort, not only because they loved the storytelling, but also for the authentic portrayals of Sun-jae and Im Sol by Byeon Woo-Seok and Kim Hye-yoon.

As if that wasn’t enough, Byeon Woo Seok singing Sudden Shower made it even more unforgettable. Though he's not a professional singer by trade, Woo-seok's delivery captured the vulnerability and raw emotion needed to portray Sun-jae’s feelings through music.

A lot of care went into making the song feel real. While the composition was ensured by acclaimed songwriter Kim Soo-yoon, Woo-seok began his training to enhance his vocals.

The producers of Lovely Runner blended the actor’s genuine vocals with professional audio editing to enhance the overall quality without losing the essence of his performance. The result was a track that sounded polished, yet stayed true to the character's emotional journey.

Fans and viewers were so moved by his stage scene in Lovely Runner that they thought a real idol had sung it, further proving how convincingly Byeon Woo-seok pulled off the role.

Also Read: Lovely Runner’s Byeon Woo-seok to star with IU in upcoming K-drama: Everything to know

Charting success: Sudden Shower's impact on global music charts

What made Byeon Woo-seok's performance in Lovely Runner even more special was how the song connected with fans beyond the show. Sudden Shower quickly became a favorite among global viewers, and its popularity exploded across streaming platforms.

Despite being part of a fictional storyline the track topped Korean charts and even made it onto the Billboard Global 200, a rare feat for a drama OST performed by an actor. Woo-seok’s impressive vocals and the song’s emotional lyrics left a lasting impact, ultimately turning a fictional boy band performance into a real-world musical success.

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