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

"In Yongin, it's considered rude to blow your nose in public, especially at the dining table. Avoid touching someone, especially an elder or a person of the opposite sex, unless you are very close or intimate with them. When meeting someone for the first time, it's customary to bow slightly as a sign of respect. Avoid using red ink to write someone's name, as it symbolizes death. It's also considered impolite to refuse a drink offered by an elder or superior. When receiving or giving something, use both hands or your right hand with your left hand touching your right elbow as a sign of respect. Avoid pointing or beckoning someone with one finger, as it's considered rude. Instead, use your whole hand with your palm facing down. It's also considered impolite to step on the threshold when entering a traditional Korean house. In Korea, it's customary to remove your shoes before entering someone's home. Avoid showing the soles of your shoes to others, as it's considered disrespectful. It's also considered impolite to talk loudly in public places, especially in temples or other sacred places. Avoid making critical or negative comments about the country or its leaders, as it's considered disrespectful. It's also important to respect the local customs and traditions, even if they are different from your own. When dining, wait for the eldest person to start eating before you start. Avoid sticking your chopsticks vertically into your rice bowl, as it's associated with funerals. It's also considered impolite to leave food on your plate, as it implies that you didn't enjoy the meal. In Korea, it's customary to pay for the meal if you are the one who invited others. However, it's also common for people to fight over the bill as a sign of generosity. Avoid arguing about the bill, as it's considered impolite. Lastly, remember to be polite and respectful at all times, as Koreans value manners and etiquette," remarked another expat in Yongin, Korea.