I say "Hey!"

I was at the MRT today, taking my usual train, walking to my next train when I spotted the side view of a familiar face from afar– A good old Friend from Poly days!

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I run towards him excitedly, Slap him hard on his back and beamed a wide smile and said “HEY!”

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He turned around, our eyes met, the world seems to stop for a moment. He stared at me, I stared at him.

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Who is this guy?