Seo Eun-sun

One sleepless night, Ji-ae walks about the apartment hallway when she hears a cat meowing. The next day, Su-young from next door visits Ji-ae apologizing for her cat yowling at night. A few days later, Ji-ae finds the next door cat in the lobby. Su-young asks Ji-ae to put her cat back in her house and gives Ji-ae the passcode to her house.