Hong Si-hoo (Korean: 홍시후; born 8 January 2001) is a South Korean professional footballer who plays as a midfielder for K League 1 side Incheon United.
Hong made his professional debut for K League 1 side Seongnam on 9 May 2020 against Gwangju.
He came on as a 76th minute substitute for Choe Byeong-chan as Seongnam won 2–0.
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