Why am I always late?

This story is about Kim gyueum (김규음) a student in a private school whose born in a very rich family, always late to everything. To family events,graduation ceremonies to going to a cafe,even to his own birthday party he is always late while his best friend Shin Nicky (신니키) is the exact opposite to him...in this series he went back to Korea after being in LA but when he came back everything changed,nicky becomes very loud and always talk to him more than usual while his senior in school Jang Jiun (장지언) seems to be worried about gyueum.... After his flight he went to a cafe that's becoming popular but when he goes there he finds a beautiful girl,black hair as black as the night and pale skin and she also seems to keep wearing white clothing but nonetheless gyueum falls in love with her immediately but it seems like Nicky knows her?!! What happened when gyueum was gone??

(disclaimer: bad grammar as English is not my first language)