Fraternal twins were forced apart due to their parents' divorce, with the younger sister following their mother and not seeing her older brother, who stayed with their father, for a full ten years. Reunited once again at Huaicheng University, the younger sister was shocked to discover that the dyed-blonde brother whom nobody in school dared to provoke was actually her very own older brother. Because they had been separated for many years and even had different surnames, the older brother completely failed to recognize the younger sister right in front of him, creating quite a few hilarious misunderstandings. Relationships on campus were intricate and complicated: brother Gu is infatuated with Song Zhiyao, Song Zhiyao has set her heart on the bookworm Jiang Linzhou, and brother Gu goes to intercept Jiang Linzhou to stand up for his sworn younger sister.