His a sunbae from his swimming days. Also the boyfriend of the photographer who takes pics of models I believe.
i don't think that's right, iirc, seo-an has the model friend too. woowon worked with him that time and they talked, i'm fairly sure that model guy and the sunbae is dating
He is sunbae from swimming days and dating Seo-an’s model friend sung yoohan
+ he is a doctor
Thanks everyone
Can someone remind me who the guy on grey talking to woo won is?