Without Seung-jo around, Ha-ni mopes nonstop. Using this to his advantage, Wang Kyeong-Su tells her where Seung-jo's working in exchange for a free dinner - served to them by part-time waiter Seung-jo himself. Her joy returns but wilts at seeing Yoon He-ra working alongside him. Failing to spend every moment she can at the restaurant to keep them apart, Ha-ni concludes that they're living together. Stalking them actually makes her sick, and Seung-jo has to take her home (which scheming Hwang Geum-Hee wouldn't have any other way, leaving Bong Joon-Gu alarmed).
—statmanjeff