Yoo Ji-an, the owner of Cafe Florence, has someone in her life who acts more like an older brother than her actual brother. He's Choi Jae-geon, the heir to Hwaseong Construction, who always seems frustratingly (or intriguingly) obsessed with her. One day, after an unexpected incident leaves Ji-an with nowhere to go ... Jae-geon is the first to reach out. "Let's go to my place." And so, their cohabitation begins. Their relationship, once filled with endless bickering and heated arguments-where every meeting turned into a clash-starts shifting strangely, charged with an unexplainable tension. "Come to my room." A simple phrase from Jae-geon sends Ji-an's heart racing ...