Did they ever have s3x?

Who? Gyujin and Sooyoung? Gyujin forced Sooyoung to give him a blowjob and later on in the series attempted to rape him by anal penetration, that’s why he was brought up in recent chapters because Jihwan is essentially doing the same things.. he’s just better at manipulation and coercion that Gyujin is because he doesn’t immediately resort to violence.