According to male calculations, they are a couple who met in high school and have been dating for over 9 years (actually 7 years and 5 months).
I found out that the man went to the Newrang workshop he met in Hwanyeon and had a couple ring fitted on his left ring finger.
As a comment, I’m not really that kind of professional.
Even though I have matched new couple bracelets and bead rings, if X shows something that I don’t like, I usually leave everything out and notice, but Yoosik doesn’t notice at all.