MTL - Full Marks Hidden Marriage - Chapter 5 Little Master found it.

System: You are the hero, go and capture that cute girl, she is the heroine.
Male lead: I have a fiancee, so I can’t cheat.
System: The heroine has appeared, she has been reborn now, you go to attack her.
Male lead: The female lead was so badly harmed by the male lead in her previous life, let her go in this life.
system:……

Read the guide:
The unit dramas are all written through books or overhead, without textual research, everything serves the plot.

Content tags: face slap system fast travel through book

Search keywords: Protagonist: Song Cun ┃ Supporting role: many ┃ Others:

One-sentence introduction: The male protagonist is difficult to do, so don’t do it.

- Description from novelbuddy

Senior high school student Dugu Hong was logical autistic and had a very high IQ. Despite his impressive IQ, he was never taken seriously by his teachers or schoolmates. While playing a recently released eastern Wuxia online game called Jiang Hu, three vicious classmates trapped Dugu into a mountain cave in the game with no hope of escape unless he deleted his account and re-register it. Not succumbing to their demands, Dugu decided to stay in the cave and explore the game system, which benefited him greatly. His persistence to obtain massive internal strength aided him in finding a superior way to improve himself, and thus opened the function of inner observation of the main and collateral channels. Meanwhile, in the real world, he discovered he had supernatural powers when he tried to save the girl he secretly loved who had caught the eye of a gangster on the suburban railway.

The empire has turned into the land of the undead due to a spell gone wrong. God summoned heroes from countless worlds to purify the empire and plant new hope. Lee Shin Woo, an ordinary earthling, was also summoned. As an undead, that is.

Utsuro no Hako to Zero no Maria, or The Empty Box and The Zeroth Maria, tells the sinister story of Kazuki Hoshino, who is almost madly attached to his everyday life, and his antagonist Aya Otonashi, who suddenly transfers into his class—for the 13,118th time. She majestically announces to “break” him, without paying heed to anyone else around them.