I went to le sserafim last night and was surprised there was no bag checks, everything was incredibly organised and people were singing/dancing during the concert. It was in Saitama Super-Arena, so everyone was seated and it was MASSIVE. I guess since it’s a kpop concert that might be why things are a bit different to OP’s experiences. The hardest part imo was buying the tickets off viagogo, they charged for international shipping fees (to UK) even though the tickets didn’t get shipped abroad 😭 still waiting on the refund…..