I'm the Big Sister in Another World

Su Yuwei could host a dinner party, cook a feast, keep her brothers in line, and discipline unruly kids. Her only life KPI was keeping an eye on her three younger brothers. But one day, all three vanished mysteriously at the same time: top student Su Chen from the library, biology fanatic Su Hai from the lab, and brawler Su Yang from the basketball court. Even the police were stumped.

Searching for her family, she followed the clues into an abandoned research institute and stepped into another world where magic and monsters coexisted. She'd planned to use modern knowledge to crush the competition, only to find that lighters were no match for fire magic, sanitary practices got face-slapped by divine magic, and even the laws of physics had to “adapt to local customs.”

Even more absurdly, the younger brothers she found were no longer the boys she remembered:

- Su Chen had become Princess Elsa of the Frozen Kingdom, cold and elegant in public, but secretly using ice magic to make popsicles. His habit of touching his earlobe when nervous gave everything away.

- Su Hai had become the dreaded King of Viruses. He'd conducted dangerous experiments and treated slimes like family, yet still treasured the copy of The Origin of Species his sister had given him.

- Su Yang had become the leader of the Axe Gang. He was illiterate and drew his accounts better than he wrote them, fought on instinct, and kept striking out with girls, but he had his gang under his thumb.

When their eldest sister arrived, the princess, poison king, and gang boss instantly turned back into little troublemakers. She twisted their ears, laid down rules, and made reforms. With modern management skills, first aid knowledge, and years of experience beating her brothers into shape, she thrived in the otherworld.