“Single’s Inferno 4” Yuk Jun Seo’s Biggest “Red Flag” Moments

Spoiler Alert
Single’s Inferno 4 cast member Yuk Jun Seo has gone from being one of the show’s most popular cast members to being one of the most divisive. Throughout the series, viewers have voiced their opinions on his behavior toward fellow cast members, and more. Here are 6 of Jun Seo’s so-called “red flag” moments so far.

1. Pushing Lee Sian
A “bed scene” date featuring Lee Si An and Jun Seo became one of the show’s most-discussed moments. In particular, some viewers felt that Jun Seo used too much force to push Si An back down when she sat up in the bed.
I’m not sure if anyone notices, but I’ve seen junseo being a bit too physical
like when he hit sian's neck on the bed.
It was so uncomfortable to watch. pic.twitter.com/JMYe6BzVrD— chae (@jungmanchae) January 28, 2025
2. Getting Kim Min Seol’s hopes up
Was Jun Seo was unfair, cruel even, to dangle a date to Paradise in front of Min Seol?
Junseo asking Minseol if she wanted to go to paradise basically getting her hopes up just not to pick her is diabolical. She deserves better #singlesinferno4 pic.twitter.com/0S2Q8nRymQ
— Yara is head Pokénon🎀 (@mvgneticmanon) January 28, 2025
3. Ignoring Chung You Jin
This scene featuring Jun Seo and You Jin rubbed many viewers the wrong way. Jun Seo received scathing criticism for not interacting with her in the communal space.
“youjin ignored junseo first” literally its not even about that. its the fact he doesnt have basic manners and even talks shit behind someone’s back when he kept talking about liking women who are honest. #SinglesInferno4pic.twitter.com/OBP7nVa0ig
— 💭 (@bIuehappiness) January 23, 2025
4. Allegations about his past
While much of viewers’ criticism stems from Single’s Inferno 4, some of Jun Seo’s off-screen behavior has also been called into question. The UDT soldier-turned-artist-and-actor allegedly created a cartoon that came under fire in 2021 for its offensive content.
요즘 솔로지옥 출연해서 화제성 좋다는 육준서 과거 패드립, 장애인 비하, 성매매 언급 웹툰 논란 타래 pic.twitter.com/xa15PT4ypK
— 맛스터 (@masterofjgp) January 24, 2025
A thread about Yuk Jun Seo who is currently gaining attention for appearing on Single’s Inferno, featuring his past offensive remarks about mothers, peoples with disabilities, and prostitution.
— @masterofjgp/X
5. “Trash talking” You Jin
In one episode, a tipsy You Jin decided to have some fun swinging on Inferno’s swings. Some viewers weren’t happy about Jun Seo’s reaction to You Jin in front of other female cast members.
This scene alone also annoyed me a lot. No one help and checked on youjin but instead all of them laughing at her. These people are rude. Especially junseo talk trash about her in front of those girls🙄 #SinglesInferno4 pic.twitter.com/5txUVlHUJv
— Kookie⁷🥢 (@goldenjk7_) January 15, 2025
6. Hypocrisy
In one episode, Si An spoke candidly to Jun Seo about her feelings. According to viewers, Jun Seo reacted much differently to Si An than he did to You Jin, who–like Si An–had expressed interest in Theo Jang.
he’s rude immature but most of all a hypocrite 🤡 look how cool n understanding he acts while Sian admits bluntly that she likes 3 guys at the same time.. but he badmouthed Youjin only bcs she chatted w Theo
these 2 disgustingly match well#SinglesInferno4pic.twitter.com/bdd1QAvJqb— navi 𓇢𓆸 (@Zgotbored) January 28, 2025
Read more about Single’s Inferno 4 here:
The “Single’s Inferno 4” Stars With The Most (And Least) Screen Time