Responses
Did you mean the black haired idol with the same red eyes as Garam? Cause the pink haired one is T-Ren whom Garam mistook as the person Jaechan is having feelings for. And yeah you got a point, but the guy was also saying that their 'eldest hyung' told him about Garam's problem which referred to Garam's actual brother that we've seen before
"younger brother" can be a term of endearment in Korean, I don't think the pink haired idol is his actual brother