Hiatus for sure. They need to let things settle down. To come in front and to promote with a smile on the face is not a good idea, knowing how much passion people put in when there is a scandal. Chanyeol and Irene's example is the best. Everyone was shocked that Irene came back to her jobs after only 2-3 months, even tho she apologized and settled things down with that girl. CY is now leaving the spotlight for 2 years.
His hiatus would make people forget a little bit about the scandal and also would be taken as the price he has to pay.