Lin Zhixia, who ranked first in English, never expected that Chen Yanzhou, the aloof top student, would deliberately score 99 points in English just to become her seatmate. She thought she was helping him tutor, not knowing he had long recognized the girl who gave him the "little sun" in their childhood. From seatmate mutual aid to a two-way rush, from school uniforms to wedding dresses, they grew side by side all the way, turning "seatmate" into a lifelong seat. Lin Zhixia is responsible for shining, and Chen Yanzhou is responsible for standing in her light forever. For others, dating is sprinkling sugar; for them, it's sweetness from school uniforms to wedding dresses, and from seatmates to a family of three.