Responses
maybe read the whole series its self explanatory..
The older sister of Dahae (mc) liked our blonde boy, he didn't care a shit abt her in that way so he never reciprocate her feeling.
The sunbae --> Old/current crush of Dahae sister, not reciprocate
The black haired boy --> ambiguous relationship, we don't know yet
IM CONFUSED WHATS HAPPENING, whats the connection bw 2 male lead and the older sister? she used to like him? did he like her back? i hate the older sister btw