[Edaily Starin Gim Ga Yeong Reporter] In the final episodes of “Four Hands,” Lee Jun-young’s chilling revenge has begun.

According to Nielsen Korea, a ratings research firm, on the 28th, the 10th episode of tvN’s “Four Hands,” which aired on the 27th, recorded a nationwide average viewership rating of 7.2% and a peak of 9%. In the Seoul metropolitan area, it averaged 7.7% with a peak of 9.9%. (Based on paid platforms, including cable, IPTV, and satellite / Provided by Nielsen Korea)
In the 10th episode that aired that day, Kang Bi-o (played by Song Kang), having realized that Choi Jeong-yo (played by Lee Jun-young) had not actually lost his memory, immediately cornered him and grilled him. Under Kang Biao’s relentless pressure, Choi Jeong-yo admitted that his amnesia was a ruse, explaining that he had pretended to have lost his memory to protect himself from the possibility that Kang Biao might try to kill him again. While investigating the truth behind the incident from nine years ago on his own, he had discovered traces of Kang Biao and concluded that Kang Biao was involved in the case.
Even though Kang Biao knew Choi Jeong-yo was misunderstanding the situation, instead of revealing the truth—that it was his mother, Kang Ji-hye (played by Yoon Se-ah), who had committed the acts—he admitted to having done everything himself. With his anger reaching its peak, Choi Jeong-yo left a chilling warning for Kang Biao: “Just wait.”
Afterward, Choi Jeong-yo’s revenge began in earnest. Kang Biao, who was tasked with premiering a song composed by Choi Jeong-yo, not only silently signed a contract containing terms unfavorable to him but also practiced endlessly during his personal rehearsal time until Choi Jeong-yo was satisfied.
In particular, Choi Jeong-yo revealed that he had channeled the terror he felt nine years ago—when he had to flee desperately to avoid the kidnapper’s gun—into the cadenza, and pointed out that Kang Biao’s performance conveyed none of that fear. His scathing criticism—“Instead of worrying about hurting your hands, express the composer’s inner vision first”—struck a chord with Kang Biao, stirring his guilt and desperation.
However, even on the day of the recording for the album release, Kang Biao’s performance still fell short of Choi Jeong-yo’s expectations, and Choi repeatedly halted the recording to push him to his limits. After being harshly reprimanded in front of the orchestra members, Kang Biao pounded the keys as if being chased, but eventually his fingers began to move erratically, and he was fired by Choi Jeong-yo.
Unable to reach the level Choi Jeong-yo demanded no matter how hard he tried, Kang Biao’s frustration boiled over. Choi Jeong-yo, while sneering that Kang Biao must have expected his ruthless attitude, crushed him by saying that his disappointment was all the greater because he had expected Kang Biao to surpass his limits.
It was, surprisingly, Kang Seung-woon (played by Jung Jin-young)—Kang Biao’s grandfather and a conductor who had once dismissed her talent—who offered her a path forward after she had hit an invisible wall and collapsed. After hearing Kang Biao’s heartfelt confession—“Even if I only have one day left to live, I want to sit at the keyboard” and “I’m happiest when I play the piano”—Kang Seung-woon advised him to break free from established norms and pour his heart and life entirely into his music.
Realizing the truth in Kang Seung-woon’s words, Kang Biao sought out Choi Jeong-yo, who had rejected him, and asked for another chance. He then asserted that, since Choi Jeong-yo’s composition was filled with hatred toward him, he was the only one who could best express those emotions—a confident statement that raised expectations for Kang Biao’s transformation into a stronger, more resilient person.
The tvN Saturday-Sunday drama “Four Hands” depicts the friendship, love, competition, and growth of young people who meet at an arts high school populated exclusively by musical geniuses. The series is generating buzz thanks to the performances of actors Song Kang and Lee Jun-young. It is also drawing global attention, ranking 10th among non-English shows on Netflix’s official site, Tudum (September 14–20). It airs every Saturday and Sunday at 9:10 p.m. on tvN.