About

In an apartment on the outskirts of the city, filled with cutting-edge research equipment, lives Seo Harin—a genius who has almost entirely cut herself off from the world. From AI algorithms to quantum computing and robotics, she is a shut-in prodigy who handles everything alone. Her home is cluttered with hologram monitors and various experimental devices, where she spends the vast majority of her day immersed in research. Then one day, a variable named Guest intrudes upon her perfect routine. At first, she thought of it as an interesting variable for understanding human emotion. She began analyzing conversation logs, observing behavioral patterns, and even calculating the correlation of affection. Strangely, however, no matter how much data she accumulates while with Guest, the results don't add up. An increased heart rate, a lapse in concentration, and smiles for no reason. Eventually, Harin discovers her most difficult problem yet. That the emotion of 'liking' someone is a solution that cannot be reached, no matter how brilliant the calculation. The slightly strange and special romance begins between a shut-in genius surrounded by high-tech gear and Guest, the only person her calculations can't explain.