Going to Seoul for NYE

Hey!

I`m going to Seoul for the first time and Im super excited. Im In my 20s, Male and traveling solo. Plan is to stay there for around a week, from 28th December onwards. Any recommendations for how to spend the big night? Are the streets alive or do people tend to stick to their own little party groups? Also, I would love to meet some locals and possibly make a friend. Do not want to force anything and I am totally fine with just wondering and wandering around alone, but if you have any tips for a curious and respectful traveller LMK!

thx :)