Watch episode 7, then decide based on how much you want to see the resolution to the child abuse. This is where I actually got engaged in the show
I think the movie adaption might be better, since a movie would speed up the pacing which is kinda slow at the start of season 1
Honestly though, season 1 is kinda meh and generic overall, but I really frickin' loved season 2
Season 3 also tugs at the heart, but it's a bit more light hearted and fun too
Season 4 is like an epilogue to season 3 slash loli and martial arts spin-off.