The bitches were going to register Se-Young's marriage with Jin-Goo without him knowing! How stupid was that! Well, I guess in S. Korea anything can happen, only in Korea. One can get married without the groom knowing.

Unfortunately, in Korea someone can register marriage alone with the otherparty's ID card and forged signiture. I watched a video about this: https://www.youtube.com/watch?v=EhGOvEUKs78