do you think I have forgotten, about you? Being in a prominent group means being expected to be 'flawless' but that was far from what they were. On stage, they shine. Off stage they're watched like hawks. They are terrified of what they feel and hiding who they are but it always lingers in the air. Between all those lies and denials, there is that one truth that could destroy their career...and themselves. Heeseung: 'he's everything I'm not supposed to want but how do you stop a fire once it starts?' Sunoo: 'The company owns our lives. The fans own our smiles...but my heart? it only belongs to him.'

Seungcheol discovers a mysterious box of letters in his mother's vault, all addressed to him. When curiosity peaks his interest, he reads the letters, each one stirring a whirlwind of emotions. Who wrote these letters? Why did they never reach? How come his mother possess them? Who loved him so dearly yet stayed silent?