My Limited-Time Ability Cards

Su Chen transmigrates into a world overrun by doppelgangers. By day, pedestrians on the streets smile as usual, but once dusk falls, countless monsters disguised as humans begin their hunt. Killing doppelgangers drops ability word cards. Once activated, a card grants three minutes of supernatural power, then turns to ash and is destroyed—usable only once, never again. As an outsider, Su Chen feels no sense of belonging in this world; survival is his sole obsession. He is just an ordinary person, timid and afraid of combat, yet endless crises force him to keep moving forward. As more survivors uncover the secret of the cards, competition, suspicion, and betrayal follow one after another. At night, doppelgangers prey; by day, human hearts hide demons. To survive long-term, Su Chen must continuously collect word cards and struggle to stay alive in the cracks of a city where truth and falsehood are reversed. — Description from novelcodex.org