The Returned C-Rank Tank Won't Die!

21st Century Abandoned Protagonist Abusive Boyfriend Adult Female Lead Adult Protagonist Attempted Murder Betrayal Black-Eyed Protagonist Black-Haired Female Lead Blood and Gore Brother and Sister Dungeon/s Exploring Dungeons Invade Earth Embracing Darkness/Madness/Insanity Emotional Abuse Female Protagonist Full Color Invincible Protagonist Long-Haired Female Lead Long-Haired Protagonist Modern Era Monster/s Murder/s Murderer/s Muscular Character/s Mysterious Object/s Personality Change/s Red-Eyed Female Lead Red-Eyed Protagonist Regeneration Revenge Ring/s Ruthless Female Lead Ruthless Protagonist Searching for Answers Short-Haired Female Character/s South Korea Strong Female Lead Strong Protagonist Time Paradox Violent Female Lead Violent Protagonist Weak to Strong Webtoon