Once a year, the entire NUEST cast has a special Valentine's Day party and this year, something different from usual occurs. The manager gives out a special order to Baekho and asks him to take candid photos of Ren, their beloved maknae of the group. Of course Baekho asks why but gets no answer in return. Soon, Baekho ventures off with this strange () mission, to find out that Ren has a valentine. Determined to know who it is, he stalks Ren throughout the city and then back to the dorm and soon, they realize their affection towards each other.