After I Got the System, My Brothers Turned into Sisters.

As an ordinary citizen, Bai Yan was more shocked that his almost only best friend Mu Qiufeng turned into a girl than the fact that he got the system. On this basis, what is even more speechless is that it turns out that he has been living in a world with superpowers - the problem is that he has no superpowers, and the system is still a martial arts system. Every time he fights, it is inevitable that his opponent will treat him as a chuunibyou.