During Siwon's service as a promotional policeman, he had come back from his vacation with a bite from his dog on his nose. He had a band-aid on the bite, and because Siwon was the face of the police squad, it had affected the way events were held.

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He was in charge of MCing, but another soldier had to step in for about a month because of the bite. During performances, he also had to switch positions from center to the edge. It's been reported that he had apologized to his fellow policemen for affecting performance due to the bite.

Previously, Siwon's family dog had bitten a neighbor, which allegedly caused her death 4 days later. Siwon's dog was known to bite people, and the family of the deceased has stated that they will leave the fate of the dog up to the family.