Ahn Dajeong is the second main character of the series. Throughout highschool she was the main protagonist kim jinsoo's personal bully. After wasting Dajeong's money on online currency jimsoo owes her a massive amount of debt. So he allows her to live in his apartment while they both attend the same college. During moving Jinsoo breaks Dajeong's "toy" and cause she can't find someone to satisfied her she uses jimsoo as a replacement "toy". While now attending college she tries to hide the fact t