Lin Yiwei, a girl from the south, came to a certain city in North America after graduating from college and became one of thousands of students studying abroad. In this city that she gradually became familiar with, she met her landlord Priscilla Liu, her boss Xu Weizong, her colleague Ada and others. During her interactions with them, Lin Yiwei gradually learned about the past of immigrants and international students struggling for tomorrow in this land of North America and in this city far away from their motherland. And as a bystander of the past and a participant in the present, she has a new understanding of many things. While she was studying abroad, she also had a task - to find the whereabouts of her sister-in-law and cousin for her elderly grandmother. This naturally involves another "North American past event". Can grandma's wish come true? Where are the relatives she is looking for so hard? Everything is still unknown.