Not at all!!! Apparently ilwoo got kidnapped by baekhee’s dad, either for ransom or as a colateral for debt ???????
But no, they’re not related
Might be cousin because il woo call that man uncle.
In Asian u can call people one generation older than u that u closed too as Aunty and Uncle eventho u dont have any blood tie with them so not really. The same case with Big Sis/Big bro thing. U can call ur own neighbour (if the age apropriatte) that because calling them by name only is kinda considered rude.
Or even stranger I suppose. But usually we using mr./mrs. (in our language). But calling stranger that (age apropriatte) is not really weird too.
So they're brothers?!