can someone tell me why there is a brotherly 爱情 couple China x Japan? because the brotherly 爱情 couple that i am used to is Spain x Romano. so what is China x 日本 about?

It makes sense in my mind. 日本 was heavily influenced 由 China early on, and adopted many of China's characteristics and culture. Later, 日本 went through and started taking over parts of China...so interpret that how 你 will.
Spamano is so cute! I <3 them!

My 最喜爱的 couple!!
Well I 爱情 this pairing because have a lot of diferent feeling between them. For start maybe, have a relationship like Uk with Us.. in the sense that both found a child's care as his brother.And later, this betrays them.
I see it that way... ^//^. But in the special case of 日本 x China. I see Japan's desire to monopolize China, seeing them as countries, those feelings that lead to betrayal. And then. Follow the repentance of having hurt the person that 你 most 爱情 in the world. I think they feel that would be painful. So I sympathize with Japan.
Well I hope I've helped a little.Sorry if I confuse you. My english isn't the best.. ^//^'
See 你 soon~~ ^^ And.... Viva NiChu's love!! ^^

Well i really like ChuNi. Because i think 日本 and China have a lot of history together. i know they have a brotherly type relationship but so do America and England (who i also love) i just think they look so cute together. I actually write fanfic on these two because they're quite beautiful, China with his 爱情 for all things cute and 日本 being cute and ukeish seems to fit for this couple to me. There isn't a lot os ChuNi 爱情 out there but i for one hope that the fandom starts to pick up soon because they truely are kawaii-aru indeed.