Chun Soo-ro is a timid, geeky cartoonist with constant panic attacks and has debilitating phobia of all forms of social interaction. In the past, she relied on her sister to help her, but her sister is now about to leave the country. At the Busan port terminal, where her sister has just departed, Soo-ro suddenly suffers another panic attack. At this time, a nun approaches her and helps her take her medication. Later, the nun asks Soo-ro to deliver flowers and a cake to a man that the nun confesses she loves.