Ryu Seung-soo calls Seo Jun-young's dating attitude a 'green apple' on Groom School 2

Actor Ryu Seung-soo drops into Groom School 2 (신랑수업2) episode 14 as a surprise guest. He does not go easy on student Seo Jun-young.

The Channel A show airs June 18 at 10 PM. Regular mentors Lee Seung-chul (이승철), Tak Jae-hun (탁재훈), and Song Hae-na (송해나) are joined by Ryu, who frames his visit through the show's school metaphor: "The school nurse position seemed to be vacant. I can treat the students' wounds and pain." Lee Seung-chul, playing principal, welcomed him with: "Depending on today's performance, there might even be a school nurse's office."

When Seo Jun-young's date footage rolls, Ryu watches closely, positioning himself as the man's guardian. His assessment stings. "Your attitude toward women is still like a green apple," he tells Seo directly. Seo builds up goodwill only to "let it all crumble in one go." Ryu diagnoses the condition as "critical."

Lee Seung-chul adds his own critique, pointing to a verbal slip Seo made during a previous date with weather caster Jung Jae-gyeong (정재경) as evidence of what he calls an "old-fashioned" streak. Seo Jun-young nods and admits his parents watched that episode. They told him: "We didn't raise you like that." Even mom and dad have notes.

Seo insists he can "show a completely different side" on the date airing in this episode. Students also include Kim Yo-han (김요한).