This is the excrement caused by pre-exam syndrome... There is a complete breakdown inside.
Please be careful before entering the Nine Heavens Divine Thunder
To sum up, this is the story of a foreign soul entering Sylar's body, leaving again, and completely transforming Sylar during this time.
It involves the plot of seasons 1 to 3, but if you haven't watched it, it won't affect your reading... Well, maybe?
Conception: