'Four Hands, Two Sonatas': Song Kang's Comeback Drama, Explained
How does a K-drama end up pairing a lead who just finished his military service with a co-star who's already back in uniform? That's the timeline sitting underneath tvN's Four Hands, Two Sonatas — and it's a stranger story than the show's own plot about two rival piano prodigies.
Song Kang finished his mandatory service on October 1, 2025. Four Hands, Two Sonatas, which premiered August 29 on tvN, is his first television project since. His co-star Lee Jun-young is heading the opposite way. He began his own mandatory service on July 21, 2026, roughly a month before the drama they shot together even aired. The two of them filmed it between late 2025 and this past July, and then Lee left for basic training before a single episode went out. He won't be doing any press for it while he's in.
As of this posting, September 4, KST, two episodes are out and the numbers behind them have moved fast enough to be worth flagging on their own. Episodes 3 and 4 land this weekend.
Two Careers, Timed in Opposite Directions
Coverage of Lee's enlistment in Korea described this drama as effectively his send-off role — his first tvN lead in roughly eight years outside guest spots, according to allkpop's reporting around the premiere. For Song Kang, it's closer to five years since his last tvN series. Same network, same show, two actors arriving at it from completely opposite points in their careers, which is a wilder scheduling coincidence than anyone at tvN could have planned for when this project was first cast.
Nobody involved has framed it that way publicly. That's worth saying plainly, since it would be easy to read intention into a coincidence: the overlap is a byproduct of two separate enlistment clocks lining up, not a marketing angle tvN built the show around.
Episode 1 doesn't waste that timing. It opens on a packed concert hall in Prague, then cuts almost immediately to a kidnapping — a swing that shouldn't work for a show ostensibly about classical music students, and does anyway because the drama commits to it instead of playing it as a twist to be explained away next episode.
Two episodes in, that's the actual pitch worth trusting: this isn't a gentle music-school drama that occasionally raises its voice. The class resentment baked into Kang Pi-o's family plays at full volume from minute one, and the kidnapping is still unresolved going into this weekend. If you only have time to catch up on one thing before Saturday, both aired episodes together run under two hours.
"The Piano Is Something He Cannot Bring Himself to Face"
Lee plays Choi Jeong-yo, a naturally gifted pianist who walked away from the instrument after a rough childhood, opposite Song Kang's Kang Pi-o, the top student at Korea Arts High School whose polish covers up his own family baggage. Lee has described the role in exactly those terms: "For Choi Jeong Yo, the piano is something he wants to face but cannot bring himself to face." He's also talked about why he took the part at all — after years working mostly opposite senior actors, he wanted one project alongside people closer to his own age before leaving.
Both actors reportedly trained with professional pianists, Lee Min-sung and Park Ju-young, ahead of filming, so the close-up hand shots in performance scenes are their own playing rather than a stand-in's. The third lead, Jang Gyu-ri, plays viola major Hong Jae-in. She's a former member of the girl group fromis_9 before her full move into acting — a detail K-pop-side readers will clock faster than K-drama-only viewers will.
Streaming, Subtitles, and This Weekend's Schedule
Four Hands, Two Sonatas airs Saturdays and Sundays on tvN at 9:10 p.m. KST, which works out to 8:10 a.m. ET the same morning. If you're on the US East Coast, that's early — but you'll catch it before most people are even up, not after. TVING carries it domestically in Korea. Outside Korea, Netflix holds the international rights, and subtitles have reportedly been going up same-day rather than lagging a week behind, which matters more here than on most dramas — a good chunk of the appeal is watching the performance scenes without spoilers leaking in first.
Episodes 3 and 4 air this Saturday and Sunday, September 5 and 6, in that same 9:10 p.m. KST slot. Because it's a weekly release instead of a Netflix binge drop, there's no ten-episode backlog to fight through before catching up — just the two hours mentioned above, and then you're on schedule with everyone else.
The Numbers Actually Back Up the Buzz
Episode 1 opened at 3.4% nationwide. Episode 2 nearly doubled that, landing around 5.9% nationwide and 6.1% in Seoul, per Nielsen Korea. In Good Data Corporation's weekly FUNdex topicality rankings for August 24–30, the drama placed first among all TV dramas that week — the first tvN show to open at the top of that chart in roughly a year. Lee Jun-young ranked first among individual cast members in the same survey; Song Kang ranked second, days after his own co-star had already shipped out.
None of that reflects viewers outside Korea, worth saying outright. But MyDramaList, which is the site international fans actually use to rate exactly this kind of show, has it sitting at 8.4 out of 10 from 972 ratings already. That's a real signal the overseas side is watching too, not just the domestic Nielsen sample.
Whether the back half can carry two lead performances built entirely around real piano playing, with one half of the pair already unreachable for interviews or premieres, is the actual question the next four episodes have to answer.
Saturday's episode is the first test — worth clearing an hour for if you're already this far in.
This is a running news series, not a one-off post — new stories go up twice a day, roughly 7am and 7pm Korea time.
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