In this sentence it means "to", but it also can be used as: "at" or "on". For example: - 화요일에 만나요. (See You on Tuesday) - 저는 아침 10시에 일어나요. (I wake up at 10.00 in the morning) :)

"에" is a location marking particl and it means "to" or "at" .

It seems that is a particle to say "to". I am not very sure =)