Saying Farewell

Farewell? Should we feel happy or sad to say farewell to a friend? An amalgamation of both I would say. I have known Keng Woo, since the first time he arrived in UK, if my memory does not deceive me then it should be 4 years. We were housemate for a few years. I shall take this opportunity to wish him best of luck for his future endeavour, whatever it might be. :)