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He got married with Siwoo, but broke up with him and brought Najun home, so the parents were surprised. They even were talking how Siwoo took their Byul and that they knew there's something to him only by his looks (it's put a funny way, because both were in kindergarten and they already knew Siwoo) Dojun himself made 'wedding ceremony' for Byul and Siwoo.
Who was it that Byul had a fake wedding with? I can’t tell who was the boyfriend Baby Byul “married” and divorced.