Jiang Du, a freshman, rented a room in the old Tongzi Building on the back street of the school in order to avoid the lights and power outage in the dormitory. After signing the contract, he was shocked to find that the roommate he rented with was Shen Tinglan, the "iceberg" sister who was famous throughout the school in his junior year. Rumor has it that her eyes are higher than her head, she always has a surveyor in her hand, and she never looks at anyone. Jiang Du was walking on thin ice, but on the first day he moved in, he saw Shen Tinglan staring at the architectural drawings on the wall, his fingertips turning white from holding a pen for a long time. He bravely handed over a glass of warm water, which earned her a cold glance. But from that day on, there were cracks in the iceberg: she thought he was noisy, but she silently dimmed the desk lights when he stayed up late to catch up on homework; she scolded him for being stupid, but after his instructor returned the drawing, she meticulously covered the paper with red pen modification marks. Until that day when the fine snow was falling on her way home, under the dim light of the corridor, he saw a cream stain on the corner of her lips from eating cake. Out of nowhere, he leaned over and kissed her. It turned out that the greatest ice melt in the world was not the warm sunshine of spring, but the "River Crossing" she whispered in his ear with a trembling voice.