Hyun Seung and Ji Won face a new challenge as they get into the stage of ennui. It was Seung Hyuk showing his interests in Ji Won, and he was an eyesore for Hyun Seung since Seung Hyuk was better at many things. Jae In wonders about a younger man who shows his interest in her. She was not sure if he was gentle to anybody or just for her. When she tries to ask him, she finds out that she was actually falling into him. At the same time, Jun Mo gets to have interests in Do Young, but he gets in trouble for his poor way of expression....

Now, Jae In is the fourth-grader, and busy with her graduation exhibition. She happened to meet her ex Yoon, that she wished not to meet up in the class. Ironically and dramatically, these two kept getting in each other's way. Hyun Seung and Ji Won, who experienced a breakup, now enjoy their relationship as the representative Campus Couple in university. ​At the same time, Ha Neul still has a crush on Pu Reum while acts like there is nothing going on since his asking out a year ago. Ji Min, the first grader, met Ha Neul at his blind date, that she met at the testing site 2 years ago....

Ji won, who is from women's middle school and high school, started to date Hyun Seung for the first time in college. JiWon minds Hyun Seung's female friend Jae In. As Ji won suspected, Jae In had a crush on Hyun Seung since long ago. Meanwhile, Jiwon saw a photo of Jae In and Hyun seung together as school models. Ji Won's misunderstanding led to a big fight. At the same time, Min Woo kept his crush on Jae In secret since he didn't want to ruin the friendship. However, Yoon, a younger male, appeared and showed his interest in Jae In....

Hyun Seung thought that he forgot everything about his ex, Ji Won. When Ji Won comes back to school, Hyun Seung realized that he couldn't forget about her yet. Hyun Seoung expects to be reunited, but Ji Won joins a student club that Seung Hyuk belongs to. Looking at Ji Won and Seung Hyuk getting closer, Hyun Seung decides to take her back. Meanwhile, Jae In tries to find a reason in herself as she kept having relationship issues. Jun Mo couldn't confess his mind over a year that nothing really happened with Do Young. The first-grader, Pu Reum, and Ha Neul kept saying they are just friends, but there is some pink-tone vibe going on between them....