Yun Soo Kim is a old close friend of B2ST. It's been three years since she has last seem them, same for the boys. Then one day while the boys were their dance practice Yun Soo came in, surprising everyone! Especially a certain baby face member. As days go by, Yun Soo and Yoseob gets closer and closer to each other. A day before her birthday, Yoseob took Yun Soo to the amusement park as part of her