Caught Off-Guard

He's a fan from America.
She's a singer slash composer.
He will do everything to win her heart.
She was hurt by her past relationship.
He's caught off-guard even before meeting her.
She's caught off-guard by seeing him on the pool.
He has a secret that can ruin their relationship.
She has a secret past which she treats as a weakness.
He will help her forget and move on.
She will open her heart.
He will leave her off-guard.
She will still love him until he returns.

Caught Off Guard - unaware, vulnerable, unprepared, surprised, unexpected, unplanned and not ready.