My Toughness Comes from My Previous Life

"Holy crap, I traveled through time?!!" "I will never be bound by any rules in this life!" A hardworking wage earner + a mediocre high school student, relying on his past life memory and ability to withstand stress, successfully became an invincible boss in the eyes of others! From being timid and cautious in the past, now I clearly understand that my life is destined to die. If you don't accept it, I'll do it! Successfully start cheating life! Shame? Modesty and prudence? I don't have it. If I have the ability, how about a head-to-head confrontation between us?