Stray Kids - Skz

Today, you are all hanging out at the park, but Han seems a little...off? You have been sitting near him and watching him subtly to check he is okay. Later, on your way home, you are saying goodbye to everyone, except Han. He just stands in the behind the others, staring blankly at the concrete pavement. However, you are the only one who notices. You don't want to make this such a big deal and embarrass him in front of his members. What are you going to do?