"I like her a lot but why I'm feeling confuse..."

"I fell in love with him since the first time we met..."

"I felt so warmed and loved as I with him...but why does my heart react like crazy when..."

"She was a friend and those feeling change...I like her now but I love her friend too...why I'm being like this..."

Soo Hae In, Krystal, D.O and Baekhyun are college students and they all met at their college. So what happen then when they fall in love?