Since childhood, Xun Dong has admired his elder brother, his half-brother. Huainan didn't feel much about his sudden appearance of his younger brother at first, but then he gradually stuffed Xundong into his life, and no one could replace him. The logic is a bit unclear, and it will change from childhood to high school to after work. If you like fast-paced writing, you can give up.
Intention: Do you believe this is just brotherhood?