Years after the 'Mad Person Disease' Jung Yihyun and Yoon Saebom twins, Jung Soo Cheol and Jung Na Ra get caught up in a disaster, this time, it's Alien Spheres that feed on humans. As they fight to survive and to get back to their parents, the twins promise each other to make sure that their friends survive too. After all, in this war, their friends have become like their family, and family always stick together, no matter what . . . right? Duty After School x Happiness ⚠️Disclaimer: I do not own Duty After School, nor do I own Happiness. I do not own any of the characters in this book except for one who is entirely my own character. All rights go to the creators of these dramas.⚠️