How strong is love? Will love really solve all your problems or just make it worse? 

Can love really be innocent or deceiving? Will it drive you nuts until you get your revenge

or will it be peaceful as if nothing was wrong or will be wrong? 

           19 year old Kang Yuna will have to decide so herself when she finds herself stuggling in the midst of her love life. Will she be able to regain everything that belonged to her? or will she have to start with a new life she never wanted? 

           Forgotten Love, is a love storyabout Kang Yuna and Kim Min Seok's (Xiumin) relationship. They've known each other for 5 years and have been dating for 3 years now.

2 weeks after their 3rd year aniverssary Xiumin decides to propose to Yuna, for he knows that their love is true love. Knowing that they'll get married in a year they decide to start planning everything, starting with wedding pictures.

While they plan EXO is revealed to have a debut as professional singers in four months. 

Will this seperate Yuna and Xiumin for good? Or will their love shine through it? During this time Yuna has been lonely and meet new friends while she waited for Xiumin outside the SM building and following him to his schedules.

She coincidentally meets her first love, which she never tells Xiumin about, and ends up in a love triangle.

Jang Dong Woo reappears in her life after deciding to focus deeply into his career as a member of Infinite. Will this make Yuna's heart waver? If not will it be stolen? Will the anticipated wedding date remain or fail?