Yu Su is an author about whom limited public information is available. The library currently holds only one work by this author, the social novel A Blind Box. Since basic details such as nationality, dates of birth and death, and English name are unknown, the existing materials are not enough to sketch a complete biography or to assess the author's creative span and overall trajectory. Judging from the social-fiction category of A Blind Box, Yu Su's writing appears to take real life as its backdrop, using everyday objects or specific situations to approach social issues and to focus on the circumstances of ordinary people and their relationships with one another. The word "blind box" in the title suggests chance and the unknown, perhaps indicating that the narrative uses uncertainty to drive the plot and to present characters' choices. As things stand, Yu Su's body of work remains limited, and its social influence and reader reception await further evidence. This introduction relies solely on the facts available in the library and may be supplemented should new works or reliable biographical information emerge.