i'm just as lost as yikyung what are they talking about?

I was hoping to find something in the comments lol

i THINK that Ahn lin and Joobin are referencing to the day they all three went to a bar together and yikyung got drunk pretty easily since he is a lightweight ( hence why he forgor- :)) . im pretty sure Ahn lin said at one moment " be good to him "or something that sounds like that. its at chapter 37 :), this chapter ( 99), she basically said that Joobin kept his word ( responsability) of taking care of yikyung.