What happens when someone you love forgets everything? Seunghyun wakes up to a different world and he is lost. Jiyong is at his side, desperate to get him back; his old hyung. Everything changes. Love is no longer just about always being with someone you care about the most; it's also about remembering everything you two had gone through together. The yesterday. 

One-shot: partly in Kwon Jiyong's point of view, other half in Choi Seunghyun's.  Some times it seems like the simplest things are what means the most to us. But when you're forced to leave behind something as simple as a friendship, would you be willing to let it go - or live the rest of your life attached to an unfulfilled promise?