Choi Hyun-sik

Aidan, a newly enlisted recruit of the Cygnus Knights had held onto the same dream ever since the day he first saw the Adversary. Like the one who could change the course of a battle alone, he, too, wanted to become a hero who would one day save the world. Yet the battle to protect Maple World proves far harsher than he ever imagined. With every battle, Aidan found himself no closer to the Adversary he admired. Instead, he was reminded of just how small he truly was. Alone amid the ashes of Limina, Aidan struggles back to his feet with nothing left to lose. "Let oblivion take my name. All that matters... is seeing this war through to my hero".

After summer vacation, So-ri transfers to a new school and finds an anonymous letter in her desk drawer with an introduction to the school and a clue to finding the next letter. "If you want to keep reading, find my second letter!" While following the clues in the letters and searching all over the school like on a treasure hunt, So-ri keeps running into a same-aged student named Dong-soon. So-ri and Dong-soon quickly become friends as they search for the letters together. As she finds one letter after another, the special connection continues, and So-ri's curiosity grows for the mysterious sender. "I want to find the last letter and thank you in person."