Reality Stars' Post-Show Romance Confirmed
Single's Inferno 3 Stars Lee Gwanhee and Yoo Sieun Announce Relationship via Instagram
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Key Points
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Lee Gwanhee and Yoo Sieun published a joint Instagram post on July 29 declaring they have been quietly getting to know each other and now want to share their feelings directly, adding that they will continue to cherish and support one another going forward.
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Their post-show public closeness has included appearances at public events, notably Yoo Sieun attending the 2024 KBL All-Star Game as a fan and taking part in a couples game with Lee Gwanhee at the event.
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Lee Gwanhee is a guard for the Seoul Samsung Thunders in the Korean Basketball League, was drafted 15th overall by Samsung in the 2011 KBL Draft, and maintains a YouTube channel called Nonggu Seonsu Gat Gwanhee.
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Yoo Sieun is a former Miss Korea Sun (2022) and has built a career as an influencer; she has also appeared on Miss Trot 4.
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Single’s Inferno Season 3, which introduced Lee Gwanhee and Yoo Sieun to a widespread audience, premiered in December 2023, providing the backdrop for their post-show connection and eventual dating reveal.
Two stars of Netflix's Single's Inferno Season 3 have confirmed they are dating. Lee Gwanhee and Yoo Sieun announced their relationship in a joint Instagram post on July 29, saying they have been "quietly getting to know each other" and now want to share their feelings directly, according to Soompi.
The couple began dating in December 2025, Her World reported. They did not pair up during the show — Lee was connected with Choi Hyeseon, and Yoo with Choi Minwoo — but the two stayed in touch after filming and gradually moved from friends to a romantic relationship.
Joint Instagram Post Breaks the News
Lee and Yoo chose to speak for themselves. Their July 29 joint statement said they plan to "cherish and support one another going forward." The post was their first direct public confirmation after weeks of growing speculation, ZAPZEE reported.
The announcement was first reported as an exclusive by Sports Chosun before the couple posted publicly, according to Newsy Today. Multiple Korean media outlets quickly picked up the story, making it one of the bigger celebrity dating reveals of the month.
Public Sightings Hinted at Romance Before Reveal
The two were spotted together well before any official confirmation. Yoo Sieun attended the 2024 KBL All-Star Game as a fan to watch Lee Gwanhee play. At the event, the two took part in a couples game together — a very public hint that their bond had grown beyond friendship.
The pair also went to an aquarium outing together, which drew attention on social media. Looking back, fans noted these appearances pointed to a relationship that had been quietly developing since the show wrapped, according to Soompi.
Who Are Lee Gwanhee and Yoo Sieun?
Lee Gwanhee is a professional basketball guard for the Seoul Samsung Thunders in the Korean Basketball League. Samsung drafted him 15th overall in the 2011 KBL Draft. Off the court, he runs a YouTube channel called Nonggu Seonsu Gat Gwanhee, building a fan base well beyond basketball.
Yoo Sieun won the Miss Korea Sun title in 2022 and has since built a career as an influencer. She also appeared on Miss Trot 4, expanding her public profile beyond pageantry. Both came to a wider audience through Single's Inferno Season 3, which premiered in December 2023 on Netflix, per Her World.
Single's Inferno 3 Keeps Delivering Couples Post-Show
Single's Inferno has a track record of sparking real relationships after filming ends. Lee and Yoo's pairing follows a pattern where cast members who did not connect on screen end up together in real life. Their story adds to the show's reputation for lasting romantic outcomes, according to ZAPZEE.
Season 3 premiered in December 2023 and quickly became a talking point across Korean entertainment media. Nearly two years later, it is still generating headlines — this time for a couple that the show itself never predicted.
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