Visiting South Korea for the first time, does any one have any tips?

Acording to the youtubers I watch who live in Korea

• Don't fall for fuckboys in Itaewon
• There are apparently 5 places of a company called KT in Seoul who speak English and help people to find the right phone contract for the time they are in Korea cause apparently other places who don't speak Korean often tend to overprice tourists and foreigner for the simcards and KT is specialised in helping foreigner
• Many people recomend to visit Bukchon
• For shopping many people also recomend a mall at Jamsil station
• One Youtuber I watch recomends to book a dance lesson at Million Dnace Studio
• If you like swimming they also recomend a place who is a bit more outside of Seoul called Caribbian bay but I think this is only good for summer
• Another mall that is recomended by many Youtuber is called COEX (You may say the place with the high book shelfs before somewhere)
• They also recomend to visit stores that sell DIY surplies around Jamsil station since they sell everything to make nail art, jewlery, phone cases,... wich is cheaper than sitting in a DIY cafe
• Try to find streetfood markets
• Many youtuber also recomend to go to Hangang-river

So jealous Haven’t been abroad in years.

Hope you have the best of times!