Maybe you have heard of "parallel time and space?"
Xuan, a young man from ordinary time and space. I could have lived this life peacefully. However, he was chosen by the gods of time and space by mistake, and he accepted the commission from parallel time and space. In this parallel time and space, everything is as it was in ancient times. The original host Chen Xuan left a mess that Xuan in the parallel space and time needed to deal with. The reward is the ability to manage time and space, but the price is the loss of the current experience of time and space.
"Butterfly Effect" is a simple term. The results that foreshadow the world are produced by multiple microcosms. Who would have thought that a butterfly flapping its wings could cause a tornado? However, it is true. Xuan is this key butterfly.
Things are not as simple as Chen Xuan thought, and sometimes things often backfire. This is the "Murphy Effect". A person in the same time and space as Xuan was also entrusted by the gods of time and space, but he became a "time and space thief". In order to stop him, Xuan must deal with that person while completing the host's commission.
(The amount of information is a bit large, so I'm not sure I can explain it any more [any similarities in plots are purely coincidental])
Intention: To be determined