Best Little Brother Ever

Ye Kai has been the eldest brother for many years, but was betrayed by his most trusted younger brother. He accidentally traveled to a different world, got the best little brother system, and actually had to make a living by being someone else's little brother. See how Ye Kai becomes the best younger brother and helps his eldest brother become number one in the world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.