I’ve Led the Villain Astray, How Do I Fix It? - Chapter 32

A lecherous army special task force soldier from 21st-century Hong Kong is selected to travel back in time, choosing to go to the Chinese Warring States Period. Unfortunately, the time machine runs into an error during the experiment. With no foreseeable way to return to the present, he must use his combat skills and knowledge of history to thrive in his new life in the year 251 BC.

Tang Hao was an honest man making an honest living, but despite all his honesty and kindness, life often looked the other way. Even when he stood up for a man in the streets, he ended up being beaten to a pulp and the man he stood up for? He disappeared. That left Tang Hao with nothing to prove and a hefty medical bill blowing through his savings. However, while he lay unconscious in the hospital, he could feel a warmth coming from the jade pendent he wore as it began to feed him with a trove of priceless information. Now discharged, and still armed with the same naivety and honesty, what will our village peasant do with this newfound power? Will he go on to conquer the hearts of a hundred women? Will he defeat the mightiest crime lords? Only time will tell, but for now, fate has many whimsical plans for Tang Hao.

Entering Tokyo in the bubble era, in this strange era, the only familiar ones are Matsuda Seiko, Nakamori Akina, Kudo Shizuka…

- Description from novelbuddy

Bob was a good guy. He had done everything you were supposed to do. He exercised, he kept to a healthy diet, he'd studied hard, gotten excellent grades, and was working towards his masters. Somehow, things just weren't working out for him like he'd been told they would. He was stuck in a thankless position, constantly passed over, and it seemed that the only being on earth that cared about him was his cat.

Then things got worse.

Never back a man into a corner unless you want to find out just how hard he can fight.