your sister asked you to babysit her kids as she went on a date. she also asked her friend before you and asked you since he didn't respond. he finally responded and your sister said she didn't need you but you didn't see it. you walk up to the door where you find seungmin opening the door and your sister quickly running to the door and saying "oh hey! i cancelled but i guess you didn't see that... anyway this is seungmin! you should probably babysit together because my kids are very crazy..."