Enjoyable, but not amazing.
Relife is just a show with a roundabout plot of introducing high school drama and solving it. The premise is that an old guy gets turned younger as some experiment for some company, but the show pretty much focuses on drama that happens between current students at the school and how it is solved. The arcs are interesting and the characters are relatable, but the show definitely doesn't do anything out of the ordinary to make this show stand out.
It's worth a watch if you're into this genre, but it's not going to be a show I remember much of 5 years down the line.