What cultural faux pas should I try to avoid making in Gwangju?

"In Gwangju, it's important to avoid using someone's first name unless you're very close or have been given permission. Koreans usually use titles or last names. Avoid blowing your nose in public, as it's considered rude and disgusting. If you need to, excuse yourself and go to the restroom. When eating, wait for the eldest person to start eating before you do. It's a sign of respect towards elders. Avoid tipping in restaurants or taxis. It's not a common practice in Korea and can sometimes be seen as insulting. Don't write a person's name in red ink. In Korean culture, it's associated with death and is considered very unlucky. Avoid refusing a drink from an elder or superior. It's seen as disrespectful. However, if you don't want to drink alcohol, you can politely explain it. Don't point with your fingers, especially at people. It's considered rude. Instead, use your whole hand to gesture. Avoid touching, hugging, or making physical contact unless you're very close with the person. Koreans value personal space and may feel uncomfortable with such actions. Don't leave chopsticks sticking upright in your bowl of rice. This is a practice associated with funerals and is considered bad luck. Avoid talking loudly in public places. Koreans value quiet and peaceful environments, and being loud can be seen as disrespectful. Remember to take off your shoes when entering someone's home. It's a common practice in Korea to keep the indoors clean. Avoid showing affection in public. Public displays of affection are not common in Korean culture and can make people around you feel uncomfortable. Don't forget to bow when greeting someone. It's a common way to show respect in Korean culture. The deeper the bow, the more respect is shown. Avoid discussing sensitive topics such as politics, North Korea, and the Korean War. These topics can be sensitive and may lead to uncomfortable conversations," remarked another expat in Gwangju, Korea.