Three Major Illusions in Life Through Time Travel

A modern dead man, a complete loser, died because he did the only meaningful thing in his life - saving people, and his soul accidentally traveled to another world. Hahaha, with such a royal opening, it seems that I am the protagonist. What? Why am I being counterattacked? Shouldn't she like me? Who is the heroine? In the trouble of time travel, he fell into the three major illusions in life: I am the protagonist, I can fight back, and she likes me. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.