The Adventure of Time Travel

Others were the protagonists in time travel, but I was cannon fodder in time travel. The system said that I was an "unskilled" alien, and suggested that I keep a low profile and be a dog. I obeyed for ten days, and when the protagonist group was about to win, I was grabbed by the boss to block the attack. Before I died, I angrily cursed the system for cheating me, and the system aggrievedly prompted: "You are a BUG, you can ignore the rules and directly absorb the opponent's skills." When I open my eyes again, I go back to the first day of time travel. This time, I focused on the hidden cheats of the protagonist group.