Sayaka is a beautiful editor who lives happily with her handsome husband. The picture-perfect life she thought she had shattered to pieces after her beloved husband's betrayal... The only emotional support she has for her wounded heart is her high school sweetheart she bumps into. She's married, but old feelings for her first love begin to tug at her heart, and there's nothing she can do about it. She can't fall in love with him—she knows that, but the harder she tries not too... Stuck in the middle between her love for her husband and her old flame, which one will Sayaka choose? Twists and turns come one after the other revealing unbelievable truths! All the ensuing mishaps will turn out to be a grand plan of revenge for which a certain woman has put her life on the line...What is the shocking sin that Sayaka has committed?!