I was always kind of hoping that he would get away from his mother.... I mean, she has been terrible and neglectful to him since the first chapter. The ring is hardly the problem here; the real problem is that Setagawa has been living with really an endless amount of abuse, and he never had the backbone to to stand up to his mom.
Now that he's runaway though, he's probably afraid that Kousuke won't understand and will try to convince him to go home.
T_T
It would be a very ironic/karmic turn of events if the photo club girls and Junseo know that Yohan has a crush on Hyung, and they try helping Yohan out.
That is an interesting twist <3