Movie was godly. TV show was mediocre.
Movie is actually the first episode, so you can skip the rest of you don't like episode 2. You can view the 1.5hour movie/episode-one as a standalone IP.
Movie was so good that its sound track topped the charts in 5 asian countries at once and remained in Korea and Japan's number one slot for 3 months straight. PAAG in the OP is actually tooting a track from it.
Prepare yourself tho. The film is comedic in many places, but is a surprise tear jerker which is the main reason the movie did so well