Gwan-hee exhibited a lack of commitment and neglect towards his partner, Hye-Seon, throughout season 3 of Single's Inferno. He manipulated multiple women, including Min-ji and Ha-jeong, creating intricate love triangles and leaving them hanging. His behavior was toxic, including making sexist remarks and dehumanizing his female castmates, potentially for entertainment purposes.

Basketball player Lee Gwan-hee's toxic behavior throughout Single's Inferno season 3 was a topic of discussion and debate. He displayed several red flags throughout the season, which raised concerns about his character and behavior.
In the initial matching session of Single's Inferno season 3, professional basketball player Gwan-hee and Hye-Seon picked each other. They enjoyed a delightful night in paradise together, but Gwan-hee's interest extended to at least three other women as the season progressed. Despite this, Hye-Seon remained loyal to Gwan-hee. Ultimately, they chose each other again at the end of the season, and Hye-Seon deserves better treatment.
Single's Inferno season 3 began with Gwan-hee and Hye-seon choosing each other and enjoying a passionate evening in Paradise. However, Hye-seon's loyalty remained unwavering throughout the season, while Gwan-hee sought the attention of several other women. Despite Hye-seon's devotion, Gwan-hee consistently neglected her, leading to a complex and intriguing love triangle that unfolded throughout the season.
6 Leading Ha-Jeong On Another Love Triangle
When Hye-seon won a women's challenge, she received the privilege of picking a man to accompany her to Paradise. Gwan-hee caught Hye-seon's attention and captivated her with his charm and charisma. Min-ji placed third because she had also desired Gwan-hee as her partner, but she had to settle for Park Min-kyu. Their romantic pursuit was evident as Min-ji repeatedly tried to gain Gwan-hee's attention, which he disregarded. Frustration and disappointment led Min-ji to express her emotions by sobbing into Min-kyu's shirt, which was perceived as immature and disrespectful. Ultimately, Min-ji chose Gwan-hee over Hye-seon, but her overly emotional behavior and lack of self-control ultimately led to her downfall.
Some of Gwan-hee's most toxic behavior has taken place after filming Single's Inferno season 3. According to Koreaboo, Gwan-hee recently said that when he first met Ha-jeong on the show, he perceived that she would be a challenge and that he felt he had to "challenge her" to bring her down to his level. This can be interpreted as a form of bullying and control, as Gwan-hee is using his power and authority to manipulate and belittle Ha-jeong.
“Throughout the first season of Single's Inferno, Gwan-hee's behavior toward the women was consistently inappropriate and unacceptable, regardless of the circumstances. While he was undoubtedly a popular and entertaining cast member, his actions cast a shadow over his reputation and left fans with unanswered questions about the authenticity of his feelings towards Hye-seon.”During the fourth episode of Single's Inferno season 3, the islanders all gathered around a campfire to talk and play games. During the gathering, Gwan-hee admitted that he was interested in both Hye-seon and Ha-jeong by pointing at each of the three women and referring to them as "one, two, and three." Since he knew their names, there was no reason to refer to them in such dehumanizing terms. His fellow Single's Inferno season 3 cast member Yun Ha-bin snapped at him to call him out, but Gwan-hee was entirely unashamed.