Go Back to 1999 and Meet Yourself

Time cannot be turned back, and there is no regret medicine in the world. Are you dissatisfied with what you did when you were young? Why not learn more useful skills? Do you regret that you couldn't muster up the courage to confess your feelings to the girl you loved, silently and carefully caring for her, and finally making a wedding dress for someone else? So why not go back to the past as an adult and educate your unsatisfied self? Wouldn't it be fun to return to your first life with modern memories, eliminate obstacles, and protect your loved ones?