Under his guidance, Serge put on a student-type blue suit and mingled with the students to slip into the campus, which is closed to visitors. A warm relationship soon sprang up between the students and young Serge.
「北大」一向禁止觀光客進入，可是張之安在他的巧妙安排下，買了一套深藍色的服裝，騎了單車，混在一大群學生中，終於如願以償地進到他嚮往已久的「北大」。