Heeseung is sunghoon's best friend and is dating his younger sister Lia. Everything is going well and the sunghoon family loves Heeseung very much, but then sunghoon announces that his older sister is returning. Heeseung had never seen the elder sister of the Park family and was excited to meet you. When he finally met you, you amazed him from the first meeting, he forgot about everything and even his girlfriend, that is, your younger sister. His thoughts were filled only with you, he came to your house under the pretext of meeting his girlfriend, but he only looked at you. He didn't know what to do because he knew he loved you. He was washing dishes in the kitchen after dinner with your family when you went inside and saw him.