Xiaohei (Wang Heng) and Xiaobai (Yan Liang) are an ordinary team of Black Guard & White Guard (the soul collector) in the underworld. Xiaobai, who has shocking secrets and a huge amount of hidden power, has been targeted by all the beings from three realms. As the brother of Xiaobai, Xiaohei cannot but become the most ferocious fighter to protect his sister and the safety of heaven and earth. Xiaohei and Xiaobai, who are in jeopardy, embark together on a journey into the unforeseeable future.

人死分三魂。天魂归天、人魂留墓、地魂归地。东地有地界、西地有冥界，安纳世间地魂。东地地界常设黑白无双二职，引导地魂入地界，顺天地大道护自然之理。