The mystery of Kim Sa Bi’s favorite HI-BOYZ member in Resident Playbook has been solved. Fans finally learned that her bias, Topkey oppa, is none other than TXT’s Yeonjun. The reveal happened during a special performance by the fictional K-pop group HI-BOYZ on MCountdown.
In the drama, Kim Sa Bi (played by Han Ye Ji) surprised everyone by showing her fangirl side. She joined Um Jae Il (Kang You Seok) in performing HI-BOYZ’s hit song When the Day Comes. During their karaoke session, she admitted her bias was Topkey, sparking curiosity about his identity.
The big reveal came when HI-BOYZ appeared on MCountdown on May 22. Yeonjun introduced himself as “Go to the top. HI-BOYZ main dancer Topkey.” The group, which also includes Kang You Seok as Umjay and TXT’s Soobin as D.I., performed their song live. Fans were thrilled to see the fictional band come to life.
HI-BOYZ was created for Resident Playbook, a spin-off of Hospital Playlist. The groupโs storyline follows Um Jae Il, a former K-pop idol who became a doctor. TXTโs Yeonjun and Soobin made special cameos as his ex-bandmates. Their appearance boosted the dramaโs popularity, especially after their performance video went viral.
Kim Sa Biโs connection to HI-BOYZ was hinted at earlier in the series. In the first episode, she subtly reacted to Um Jae Ilโs dance moves. Later, she casually mentioned details about his life, proving she was a longtime fan. Her confession about Topkey added a fun twist to her growing bond with Jae Il.
Resident Playbook wrapped up on May 18, but the HI-BOYZ performance kept fans excited. The drama blended medical stories with K-pop, making it a hit worldwide. The MCountdown stage gave viewers one last treat before the showโs finale.
“Canโt wait for their reunion!” โ Fan reaction on social media. “A reunion after all these years?? They really pulled us right back into 2013. This is actually emotional.” โ Another fan comment.
The fictional groupโs success mirrors other drama-made bands like Lovely Runnerโs Eclipse. Fans loved seeing Yeonjun and Soobin in unexpected roles. Their chemistry with Kang You Seok made HI-BOYZ feel real, even though the group only exists in the Resident Playbook universe.
The drama also featured a special episode on May 24, where the cast reunited in a cafรฉ setting. They shared behind-the-scenes stories and favorite moments, giving fans a heartfelt goodbye. Resident Playbook ranked as Netflixโs top 10 in multiple countries, proving its global appeal.
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