On the night of his tenth wedding anniversary, Kai suddenly collapses and is admitted to the hospital.

Due to overwork, Kai is exhibiting signs of memory loss. With no effective remedy currently in place, his doctor proposes an experimental treatment that may help Kai retain at least some of his precious memories.

Kai is given an experimental technology that will allow to him to retain only one block of memory, leaving him with a difficult decision to make.

In going through his memories, Kai realizes that he hasn't been there for his family when they have needed him.

Kai regrets not having been there for his family and hopes in his heart for another chance.

Kai asks for his family's forgiveness and makes a promise to always bring them happiness.