A day out in Seoul~~

I wanted to go on a weekend trip to Seoul, but lately, there have been so many dangerous incidents happening all over Seoul that I feel uneasy about going. In the past, people warned that narrow and dark alleyways were dangerous, so they advised walking on busy main roads, but these days, even with many people on the main roads, the world has become a scary place. ㅠㅠ Still, I can't give up on my long-awaited trip to Seoul. Where would be a good place to visit for a day trip?