The South Korean striker is set to line up for Bayer Leverkusen in tonightâ€™s Champions League clash.
"I was a United fan as child and I was always happy when they scored," he said. "Now Iâ€™m going to be playing at Old Trafford and thatâ€™s a great honour. Iâ€™m really looking forward to it.
"Iâ€™ll learn a lot in the match and it will be really special moment for me but I will try my best to win the game."
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