Marci Shimoff

饰：Narrarator

Sonja Lyubomirsky

饰：Self

Gregory Berns

饰：Self

Nic Marks

饰：Self

Chikanobu Okamura

饰：Self

Ronaldo Fadul

饰：Self

Shirley Phelps-Roper

饰：Self,(archive footage)

Ushi Okushima

饰：Self

Ed Diener

饰：Self

Mihaly Csikszentmihalyi

饰：Self

P. Read Montague

饰：Self

Matthieu Ricard

Matthieu Ricard

饰：Self

Tim Kasser

饰：Self

Anne Bechsgaard

饰：Self

Roy Blanchard

饰：Self