K-pop Fan Culture You Should Know Before the Concert

South Korea is not a tipping culture — whether at restaurants, taxis, or hotels, you only need to pay the amount written on the bill, and you don't have to worry about calculating how much extra to add.
At concerts, each artist has designated official lightstick colors and "tte-chang" (a fan cheer method where all audience members sing the chorus together) — if you search "fancam tte-chang" on YouTube beforehand to learn the cheers, you'll enjoy the concert much more.
Most indoor concert venues prohibit photography and recording. Even after the announcement, you can be stopped if you film, so only use the official filming-allowed section (usually the first 1-2 songs).
Fan sign events and fan meetings mostly use a lottery system where you receive raffle entries based on the quantity of merchandise purchased — to increase your chances of winning, check the "random raffle" events on the official online store.
In public transportation and public spaces, talking loudly on the phone or making noise is considered rude — in the subway especially, it's important to keep quiet as a matter of etiquette.
At convenience stores and restaurants, self-clearing (returning your dishes yourself) is standard — it's common practice to personally return your finished dishes to the designated area.
Cutting in line (queue jumping) is considered very rude — especially in front of fan sign events and popular restaurants, there's a strong culture of strictly maintaining order in line.