Six years ago, Baekhyun discovered his best friend Sehun’s affair with his girlfriend Minjoo. The pair left him for dead, but six years later, Baekhyun is back for revenge. He plans to ruin Sehun and Minjoo, starting with their marriage and ending with their livelihoods. —or— Baekhyun wants to be the villain who gets revenge and a happy ending, but he can’t have both.

Kim Junmyeon, is a smart architect who will never let go of a good chance. Yoo Jiwon, is a selfish CEO who will never let go of her company. Despite the hate they feel for one another, these two people have to work together because they made a win-win agreement, but who will win at the end?

Linna and Sunghoon's relationship is still pretty much low-key with only a selective group of people knowing about it. The couple didn't mind and seemed to be content where they were. Still, Linna wonders if she'll ever get the chance to truly call Sunghoon 'mine' when his female childhood friend seems to like him just as much as she does and actively gets in-between them.

Kierra finds out that she's been used as a part of one of her sorority's team's scavenger hunt due to the black heart and yellow rose tattoo she has. Fortunately, only her fellow sorority sisters know and everyone that's not in the know wants to get a picture proof of it to win a prize will have to do some extra work to locate the tattoo and its owner. Well, that's what Kierra hopes for.