You were currently living your normal life in Korea, your sister who is 1 year older than you had an heart illness and you cared about her so much then one day your sister felt something special and also the same time she had to go to UK to get a heart surgery she said that she fell inlove with someone and it's name was 'Junghwa' and she favored you to find that guy until she could come back and you immediately followed it

When your sister left and went to UK you went to school and decided to find that guy and you discovered that 'Junghwa' was Yoon Hoshi's best friend because he and Hoshi were always together. And after that Hoshi discovered that you were always looking at Junghwa observing him and Hoshi thought you like Junghwa and Hoshi confront you and that's it when he realized that you didn't like Junghwa.. but the only fact is that Junghwa likes you..

One day you and Jeonghwa were in a restaurant and Hoshi was there and was wearing a uniform because he was working in that restaurant, when you guys were talking you spotted your sister at the door crying because she missed you so much after 2 years and you immediately got up and Jeonghwa and Hoshi looked at you both who hugged each other. When you got home with your sister, your sister spoke "I can't believe I saw Hoshi for the first time" when your sister said that you got shocked because she mistook Jeonghwa as Hoshi but you just let it go even though you like Hoshi too but you don't want to hurt your sister