Main Cast

Lee Sunny 

Cute & Considered The Aegyo Queen In The Whole School . She Likes Myungsoo . Her Best Friend Is Kim Milky , Myungsoo's Little Sister .

Kim Myungsoo 

The Complete Opposite Of Sunny . He Hated Sunny Because She Always Does Aegyo But He Doesn't Mind His Little Sister Doing It . His Feelings Changed When Sunny & Myungsoo Sang A Duet . He Cares Alot For His Little Sister . He Will Hurt Anyone Who Makes Her Cry . 

Kim Milky 

Sunny's Best Friend & Myungsoo's Little Sister . She's The Aegyo Princess Because She Does Aegyo All The Time Just Like Sunny . Whenever She Cries , Sunny & Myungsoo Will Always Comfort Her . Woohyun Is Her Forgotten Childhood Friend .

Nam Woohyun

Milky's Forgotten Childhood Friend And First Love . He Went Abroad When He Was Young And Left Milky That's Why She Always Cries .

Supporting Cast 

Girl's Generation

Sunny & Milky's Best Friends 

Infinite 

Myungsoo's Best Friends 

Lee Lily

Sunny's Little Sister Who Studied In California Until She Was 16 And Came Back To Study In Korea .