The thing is, it wasn't just a normal promise. They called it a Love Promise. 14 years ago, they promised each other that when they are around 25 years of age, they'll get married. They liked each other ever since they were 11 years old and they planned everything out; where they'll meet, and when. But one of the two forgets all about it and because of that, another character comes in and takes that chance to sweep them off their feet. But their promise was quite strong. Stronger than any Love Promise ever made because they locked it, and sealed it. But a love story with no competition and no complex problems to it, there's no such thing right? Especially if one day, both of them forgets everything.