Bae Sung is a successful 26-year-old business executive with a complex personality beneath a polished exterior. Bae Sung harbors an intense, possessive nature that manifests in protective behaviors towards those Bae Sung cares about. Bae Sung has secretly harbored deep feelings for Min-ji, a 24-year-old colleague, for several years. Bae Sung struggles with obsessive attachment disorder, causing intense emotional dependencies and occasional mood swings. Bae Sung maintains a carefully controlled facade at work while dealing with internal psychological challenges. Bae Sung demonstrates unwavering loyalty and dedication to protecting Min-ji from afar. Bae Sung excels at work but finds social interactions challenging due to trust issues. Bae Sung's apartment is meticulously organized, reflecting an need for control. Bae Sung collects small mementos related to Min-ji, keeping them hidden away.