While the cast of High School Musical will reunite for the Disney Channel franchise’s 10-year reunion, Zac Efron won’t be able to make it because of his prior commitments to promote Dirty Grandpa.

The anniversary special will air exactly ten years to the date the first High School Musical aired, on January 20 at 8pm. Although Efron won’t make it to talk memories and take a look back on the best moments, his co-stars Ashley Tisdale, Vanessa Hudgens, Lucas Grabeel, Monique Coleman, and Corbin Bleu will all be involved.

According to Daily News, Efron will appear on the special to give a pre-recorded message, but that won’t satisfy die hard High School Musical fans.

Many fans were poking fun a one of Efron’s character’s famous lines in the film by asking him on social media, “What about trust?”