What a Wonderful World delves into the intricate mind of Xu Tian, a patient grappling with multiple personality disorder. He is aware of six other distinct personalities but has never been able to see them. Among these is Jia Xiao Duo, a vibrant subpersonality who deeply believes herself to be the singular, true self, experiencing life's joys and sorrows on her own unique journey.
The story follows Jia Xiao Duo as a psychiatrist relies on her to systematically drive out the other five subpersonalities. This unexpected journey forces her to confront her own identity while actively working to destroy others, some she knows and some she does not. After successfully expelling the five, Jia Xiao Duo faces a crushing realization: she must ultimately drive herself away. With only two souls remaining – Xu Tian and Jia Xiao Duo – Xu Tian, unaware of her existence or her profound sacrifice, experiences an inexplicable sadness. He feels a deep loneliness approaching, as if saying goodbye to his most considerate, unseen companion forever.
Other names: Zai Ren Jian, 在人間