As you may tell this is a manhua, so it originates from China. In China's online literary world, there is a super common type of trope that has gained popularity in the past 2,3 years called "the system trope". In this trope, the main is usually an ordinary person in the modern world, who for some reason got hooked and attached to a "system" (the pig, for example) and may or may not go to another world/dimension (or multiple worlds in some cases) to complete a bunch of missions that the "system" assigned to them, and they could be punished for not completing said missions. Now, do we know why the system chooses the main? Why do they have to do these missions? - Depends on the author really. Some of them based the whole storyline on this one plot point, some glazes over the explanations and focus on other things instead. Either way, you're in for a fun ride my friends.
As you may tell this is a manhua, so it originates from China. In China's online literary world, there is a super common type of trope that has gained popularity in the past 2,3 years called "the system trope". In this trope, the main is usually an ordinary person in the modern world, who for some reason got hooked and attached to a "system" (the pig, for example) and may or may not go to another world/dimension (or multiple worlds in some cases) to complete a bunch of missions that the "system" assigned to them, and they could be punished for not completing said missions. Now, do we know why the system chooses the main? Why do they have to do these missions? - Depends on the author really. Some of them based the whole storyline on this one plot point, some glazes over the explanations and focus on other things instead. Either way, you're in for a fun ride my friends.