An adult's toy

After breaking up with her boyfriend, Su-yeong decides to sell a limited edition toy she bought but never got around to using. She posts it on a secondhand market, casually listing it as an "adult's toy," and not long after, she receives a message. The buyer suggests a direct transaction, and after some hesitation, Su-yeong arranges to meet. On her way to the meeting spot, who will she find waiting for her?