Yi Yiyi is the principal of Tianyin High School, but because her mind is sometimes too childish, she becomes an idler in the school.
Later, Guo Cailin decided on a plan for the whole school's teachers and students to travel and study at the same time. Yi Yiyi had no choice but to follow him. The "weird uncle" boy he met in the hotel, the long-haired beauty he met in the shower room, the transvestite in the toilet... Why did they all seem to know Yi Yiyi?