On Christmas Eve in 1968 six-year-old army brat Clairee simultaneously learns the hard truth about Santa Claus and the realities of war. Her bullying older brother Mickey informs her that Santa insn't real and that their absent father is actually far away, serving his country in the Vietnam War。纪璇自小立志自强,与因病转学的贺临川成为朋友。多年后重逢,纪璇请贺临川假扮男友回家过年。经一系列误会与挑战,两人假戏真做。贺临川身份曝光后,历经波折,两人终确认彼此心意,有情人终成眷属……。