Unbreakable - Chapter 3 - Since everyone already knew

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

Deemed hopeless by her family and that she was better off married when her fourth novel continued to be a flop, aspiring author Xiang Wan begins to doubt herself. While feeling conflicted about continuing her dream as an author, things take an unexpected turn when a dazzling guy appears before her and takes her to the police station.

Xiao Ran transmigrated to a fantasy world. As a dungeon guard in the Celestial Dungeon, with a special floor called the Purgatory meant for powerful demons and martial arts experts, he faced a huge challenge from the start. The Eldest Princess acquired a forbidden martial arts technique and was banished to the Purgatory. However, no one was powerful enough to restrain her. All the dungeon guards were defeated. Xiao Ran stepped up and declared, “Your Highness, it’s better for you to behave yourself on my territory” and effortlessly subdued the Eldest Princess.

He progressed from imprisoning the Eldest Princess to delivering the Great Xia Kingdom from the evil clutches of various demons and evil martial arts experts.

…

Xiao Ran was the mastermind behind the scenes.

Because of a mission, Bruce White entered prison as a criminal, but his family was abused and bullied as a result. After three years of life in prison, he finally completed his mission. Yet, he received truly shocking news when he came out of prison. His father had passed away, his mother went missing, but he knew nothing about it. Filled to the brim with rage and grief, Bruce gathered his forces and headed towards the city as fast as possible.