'Happy Kong Day' to VIXX's Hongbin! We love how VIXX's Twitter handle says 'Happy Kong Day' rather than 'Happy Birthday'. Fans will know it's one of Hongbin's endearing nicknames.

September 29 marks Hongbin's 22nd birthday (23 in Korean age). He's grown up a lot since the childhood picture VIXX posted, hasn't he?

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Be sure to wish Hongbin a happy birthday on his SNS! Happy Birthday, Hongbin!