When she was 16 years old, girl Su Wanwan met Aaron, a handsome exchange student from Germany. A chance encounter at a corner and Aaron's gentlemanly behavior made her feel good about him. Wanwan, who thought the two would never meet again, accidentally made a fool of herself at the school's masquerade party. Fortunately, Aaron came to help. The two gradually became familiar with each other... Aaron, who was lonely in a foreign land, felt the warmth of home from Wanwan... The exchange only lasted for one year. Where will they go after one year...