This is a simple story directed with style. There is a boy band and the song they sing is fun. The cartoon world is shown and what is shown is a series highlight- particularly the character/performance of a fellow cartoonist who just won't leave the grumpy lead be.
Acting is often awkward and one note- I had particular problems with several of the boy band members and the lead. There is also an issue not unheard of in both BL and Non BL stories- if one of the characters is so morose, negative, angry all the time- why would the other person keep pursuing them?
Worth watching for the side characters- there is also a fun trip home where we meet the cartoonist's mom and sister.
I would rewatch any scene with the side characters I've mentioned and skip the rest.