Tenacious
Happiness is a circle that's tenacious. In other words, we're all in this circle/cycle where we do whatever we can to grab onto happiness and hold it as tightly as we can.
Be tenacious about happiness in your life. No matter how many times it slips away, don't give up. Keep going after it, because it will absolutely come back if you're tenacious enough.
しゅう, しつ
と
None
Happiness is as tenacious as a shih tzu (しつ) with a shoe (しゅう). That little dog does not want to give up on the shoe, no matter what's happening around it.
Will someone take the shoe sometimes? Yeah, but the shih tzu doesn't give up. That's how you need to be with happiness. Kids, be tenacious!