In this short scene, Su Su explains to her father that she is here to offer him a deal: she will help him hide who he really is and help him play his role as Su Su without being suspected, in exchange for his help in reforming the official documents system. Su Su says that she doesn't want her partner to get entangled up in "all kinds of trouble," unable to even "take care of herself" , so she's going to "sacrifice myself" for greater good