Yu Changan felt possessive the first time he saw Siguli. He just wanted to be his junior brother.
After meeting Yu Changan who was kind to him in his hometown, he turned into a clingy little dog and wouldn't allow anyone to get close to his senior brother.
Yu Changan: Get away, this is my junior brother
Missing my hometown: Don't get close to my senior brother
Passerby: Haha
Purpose: grow up happily and protect your homeland