What if the perfect daughter of everyone's dreams was a real person? Na-sol, who seems to have a perfect appearance, grades, and even personality. And Da-eun, who secretly has a crush on Na-sol. The two gradually grow closer due to a chance encounter. However, Na-sol's true personality is very different from what Da-eun had known all along. Da-eun doesn't dislike this unexpected side that Na-sol only shows when they're alone. The special feelings they have for each other soon develop into a fresh first love, but there are too many eyes chasing after Na-sol. There are also too many people trying to control her. Eventually, the two face separation in front of the wall of reality. After a long time, Na-sol reappears before Da-eun as actress Son Ah-young. In front of the now higher wall of reality, Da-eun struggles to keep her distance, but Na-sol, who is now ready to give up everything to protect Da-eun and be together, does not back down easily. Finally, Da-eun acknowledges her feelings for Na-sol, which have never faded even for a moment, and the two begin to nurture their love as if to make up for the long time apart. Just when they thought peace had finally come to them… an unexpected enemy begins to interfere with the two. But everything has changed since their innocent first love. There will be no second separation in the dictionary of Da-eun and Na-sol!