A Happy Moment

I received the textbooks of next semester, this morning.
It means my happy summer vacation has come to the end...

This picture represents a happy moment of this summer.
It was taken on Aug 1, when Sun and I went to JANFUSUN FANCYWORLD(劍湖山世界).
Sun thinks that they have got the most exciting roller coaster in Taiwan.

Can you identify Sun and I from this picture?
:-D