Last week, I made a plan to go back hometown and took a visit of my grandparents. They were so excited to see me because we hadn't seen each other for a long time. But my friend invited me to take part in his birthday party, and they had prepared many excellent activities. I really wanted to join and share his happiness. But thinking about the promise that I had made to my grandparents before, I was struggled to make final decision. As I didn't want to break my promise, I chose to refuse my friend's invitation. When I saw my grandparents' smile and the delicious food they cooked for me, I knew I did the right thing. We must keep our promise. If we can't do it, it is necessary to explain, or we will lose trust from others.