Piggy bank at home

Tet is coming, parents go to wish Tet, only Ty is at home. A while later, guests come to wish Tet. Ty goes out to welcome the guests:

- Happy New Year, I wish you good health and happiness all year round.

- Thank you. Are your parents home?

- No, my parents have gone to celebrate Tet, it's just me and this piggy bank at home!

What?

At noon on the 29th of Tet, while preparing to eat, he heard the sound of a gong. Strangely, because the gong usually only rang at night, the father told his 6-year-old daughter:

- What are you looking for?

The daughter ran to the end of the alley to look around for a while, then ran back, looking very important as she reported to her father:

- Dad, the iron gong!