They have been using rings for a while, you can see Heeso wearing his when he is telling Dojun about how Chowon apologized to him in chapter 90.
You can see the rings in their hands in page 26 of chapter 91.
Oh yeah true. But Are they married? I wanted to see their wedding unless they don’t believe in marriage
I don't know if they are married per se, but I remember reading in a Spanish page that Fargo said Dojun has something like a trauma with marriage life due to Chowon, so they wont be getting marry in a near future.
Gotcha!
What?! No ring?!!!!!! I’m disappointed but at least byul is cute and heesoo and dojun are hot