What flag is this?

green seme and red uke

erm why is uke red

I don't wanna spoil it cuz it'll give away alot of the plot but I can just say that he takes advantage of the seme ALOT. the stories main plot point is also about revenge so keep that in mind when reading the manhwa.

Can you just spoil it and please tell me if the seme will grow a bit by time bcs he is too young and small to be honest