When Jinyu was 8 years old, his mother brought back a daughter who became his sister. She always smiles and is very sensible. Jinyu hates her smile because anyone can see it.
Jinxi always follows his brother, but Jinyu is hot and cold to him, but Jinxi actually doesn't care.
Jinyu feels that Jinxi is becoming more and more disobedient.
Purpose: Discussion of love