Song, best known for his roles in "Love Alarm," "Sweet Home," and "Nevertheless," is currently serving in the South Korean military and is expected to be discharged in October 2025.

His agency, Namoo Actors, confirmed on June 30 that "Four Hands" is one of several projects under consideration.

"It's one of several proposals he has received and is currently under review," the agency stated.

The series "Four Hands" will reportedly center on students at an arts high school who specialize in piano, with the title referencing a duet style where two pianists play on the same instrument.

The winding narrative is purported to chronicle the characters from their formative years into adulthood, weaving an intricate tapestry depicting the complexities of romance, ambition, and artistic evolution.

Despite the storyline's expansive timeline, much of the dissent has focused on Song potentially returning to yet another high school character—a pattern that has typified his formative career stage.

"Does it really suit a 30-year-old actor fresh from the army to play a teenager again?" one commenter wrote on a popular Korean forum.

Another added, "His image is too locked into these youthful roles—he needs to break out."

Some expressed concern that Song's repeated casting as a student could impact his long-term growth as an actor.

"It's hard to immerse in a story when grown men keep playing high school kids," one user noted.

Still, many fans defended the potential casting, arguing that Song's youthful appearance and acting style are well-suited for coming-of-age dramas.

"Let's be honest—Song Kang isn't known for his acting range, so sticking to what works isn't a bad idea," wrote one netizen.

Another remarked, "He looks young, and his vibe still fits these fresh roles better than heavy, mature characters."

Since his debut, Song has built a reputation as a visual icon and romantic lead, earning the nickname "ultimate flower boy."

However, critics have long pointed out a perceived lack of acting depth.

Some hope that "Four Hands," which reportedly incorporates themes of emotional trauma and musical excellence, could offer Song a chance to evolve.

"It's not just another high school drama," wrote a television critic on Naver. "It's potentially a mature story wrapped in a youthful package."

As of now, no official casting decision has been announced.

Song's choice of project will likely play a pivotal role in shaping his post-military career, whether it continues his image as a youth drama staple or marks a step toward more complex roles.

"We're excited for his return and confident he'll make the right decision," Namoo Actors added.