Grieving the loss of a best friend she couldn't protect, an ex-bodyguard sets out to fulfill her dear friend's last wish: sweet revenge.

The seventeen year old 'Yeong-jae' was safely sent away to the group home 'Isaac's house'. He is old enough to leave now, but doesn't want to go back home to his irresponsible father.

Yong-ju, Gi-woong and Gi-taek used to be best friends in middle school, but in high school, Gi-woong becomes a member of the gang that bullies Gi-taek. As Yong-ju tries to fix this broken relationship, he realizes his special feeling toward Gi-woong.

Woo-jin, a furniture designer who wakes up in a different body every day, falls for Yi-soo, a woman he meets through his work.