A-deli

The ‘Bluebird’s Letter’ exposed noble secrets, ruining families. When debates about its author raged, Kirien Kailos, the ‘Blood Wolf,’ confronted Saint Selene Leclair. “I know your secret,” he said, threatening to reveal her authorship unless she came to his mansion alone. Troubled, Selene sought advice from past saints. “Is he handsome?” they asked. “Yes,” she replied. “Then go. Life’s too short to miss opportunities."

High school student Han Jiseo is perfectly happy to be reborn as an extra character in a manhwa. Her side character always scores second place in the entire school, after all! The male lead, Ju Yiwon, is welcome to first place; Jiseo's happy so long as she can get into university. But one day, Ju Yiwon doesn't come to school... and Jiseo scores zero on a test. "Don't tell me... my grades depend on the male lead?!" If Jiseo wants to make it to university, Ju Yiwon needs to be present. Thus begins Jiseo's ultimate mission: make sure the male lead attends school! (Summary adapted by me from Kakaopage.)