"Because you're not serious, I need you to follow him around for me..."

"I did it from the bottom of my heart...and I end up in this position..."

"Love me the same like how you used to..."

"I thought I had loved her but...you changed my mind..."

"Why is it that you only see me as a friend?..."

"I was born to love you so look only at me..."

"If only I could turn back time..." - Taeyeon

Taeyeon and Tiffany are best of friends AND because they are best friends, Taeyeon agreed to help Tiffany out with her plan. The plan to follow Tiffany's boyfriend, Park Chanyeol, around and to become his friend while staying on a low profile. Why? All because Tiffany believes that Chanyeol is cheating on her. 

But...

What happens when things doesn't turn out the way Tiffany had planned? Or how they expected things to go? What if...just what if...Chanyeol cheating does come true? But not with a random girl...but with her own best friend Kim Taeyeon? Follow Kim Taeyeon's story of how she hate school but was forced to go back to school all because of a mission that her best friend came up with. How she falls in love with not just 1 man but with 4 men at the same time. How they all sweep her heart and how she can't seem to choose. 

Suho, the one who she saw as a friend at first...

Chanyeol, the one who she WASN'T supposed to fall in love with...

Sehun, the one who she helped...

Kai, the one who she dated...

Follow Taeyeon as she goes through a roller coaster of laughter, to creating wonderful new memories with people she encounters, to heart breaks and betrayal.