Zi Tong is a multipurpose term that can be used as a noun or an adjective.
It's not just one specific person or anything, but anyone can be a Zi Tong, or act like a Zi Tong.
One can
even have the condition of Zi Tongitus.
Zi Tong can be a person, it can be contagious, or a state of
mind, or a certain behaviour.
It's versatile,
deep, and meaningful.