Just a simple reminder of a grammar pattern I learnt but forgot about.
You can use this when you’ve decided to do something.
그래서 오늘 그 친구를 만나기로 했어요.
So today I decided to meet that friend.
You can use the more convoluted form 그래서 오늘 그 친구를 만나기로 결정 했어요 as well.