I've wanted to watch this this for a while since I saw some people comparing it to "Boys Over Flowers" (aka "Hana Yori Dango"). In hindsight, I think it's kind of a disservice to the drama though to call it a "BOF rip-off" just because it has a similar premise. I won't get into the plot because there's already plenty of reviews of "He's Into Her" on here. I'll just list what I liked and disliked about the series.

Likes
1) The premise. I will never get tired of seeing a spunky girl stand up to a clique of rich boys lol. If you also enjoy this premise, this will be a fun drama for you.
2) Friendship. This isn't an ensemble drama but I really liked the large cast of friends of the FL and ML.
3) Romance. The romance here is surprisingly strong for a teen show. Donny (playing Deib) and Belle (playing Max) have really good chemistry and I see why they're a new "loveteam" now. The side couples aren't really that strong though.
4) Theme strong. I really top-notch, boyband theme song. I love it.

Dislikes
1) Rivals. RJ and Kim are the love rivals for the FL and ML. They are mentioned semi-frequently before they finally appear, but their real appearance still feels too late in the game. They end up feeling like unnecessary obstacles.
2) Fighting. Around the mid-point of the drama, the FL and ML's fighting felt really annoying.
3) Dropped and unfinished storylines. A love triangle between Ysay, Migz, and Hunter is set up but dropped. The series ends with a lot of unfinished storylines, such as Deib's brother. This is annoying as I would have preferred the story to be self-contained with the season.

"He's Into Her" is a fun, fluffy romance. The characters are well-written for what they are. Their motivations make sense and can apply to the real-world. Though it feels somewhat like a Wattpad story, I'm happy that they went that way instead of into soap opera territory. Now time to watch the sequel. Crossing my fingers that they don't ruin it lol.