Childhood sweethearts, a legal elite and a lecturer in the philosophy department, started living together under the influence of fate. The calm and sinister lawyer weaves a love network by boiling a frog in warm water, while the university lecturer, who appears to be a royal but is actually confused, gradually falls in love with her day and night. From the aroma of morning coffee to the light of the study room late at night, from the accident in the campus lecture to the tacit cooperation in the court, the two confirmed each other's feelings in the details of life. When the starry sky necklace that was not given as a gift shines again, can the acquaintance of twenty-five years finally come true?