It's a has a lot of suspense and action, which hasith a lots of assassins.

For example, I was like why does this guy holds a grudge against that guy?

However, the assassins were really cool.

The Novel, Grasshopper

I read someone's entry about the novel, Grasshopper, a few weeks ago.

It's a suspenseful action film/movie/etc. which has lots of assassins/hit men.

Or, you could say, "it's a thriller, which has..."
"Hit man" is an alternative to "assassin" that's used in the modern day, especially if they're used for killing not high status people.

I found it difficult to catch upfollow the story because there were many characters.

For example, I was like why, "Why does this guy holds a grudge against that guy?"

However, the assassins were really cool.

The Novel "Grasshopper"

It's a suspense action which hasfeaturing lots of assassins.

I found it difficult to catch upfollow the story because there were so many characters.

For example, I was like, why is this guy holdsing a grudge against that guy?

However, the assassins were really cool.

There was a plot twist in the end, and it developedcame unexpectedly.

Another option: There was an unexpected plot twist in the end.

It's a suspenseful action which hasmovie with lots of assassins.

I found it difficult to catch upfollow the story because there were many characters.

For example, I was like why, "Why does this guy holds a grudge against that guy?"

However, the assassins were really cool.

The NMovelie Adaptation of Grasshopper

Suggest tweaking the title to match the content

I read someone's entry about thea novel called Grasshopper a few weeks ago.

I was curious about it, so I watched the live action versmovie adaptation on Netflix.

It's a suspense action which hasthriller with a lots of assassins.

I can't compare the original story to the live actionmovie, because I've never read the novel.

Honestly, ithe plot was complicated.

I found it difficult to catch upunderstand the story, because there were manya lot of characters.

For example, I was likedidn't understand why this guy was holdsing a grudge against that other guy?.

"I was like" feels more colloquial

However, the assassins were really cool.

It's a suspense -action which hasmovie with lots of assassins.

I found it difficult to catch upkeep up with the story because there were so many characters.

For example, I was like why, “Why does this guy holdsave a grudge against that guy?”

However, all of the assassins were really cool.

There was a plot twist inat the end, and it developed unexpectedly.

I think the matching Japanese for this sentence made sense, but the corresponding English is redundant. While I believe that there are cliché plot twists that can be anticipated, Google says that plot twists are unexpected by definition.

TheALSO POSSIBLE: A Novel Grasshopper

I read someone's entry about the Barbara Vine's 2000 novel Grasshopper a few weeks ago.

NOTE: Perhaps more than one novel has this title. I recommend specifying the author and date of publication. It will help readers understand the context more clearly.

MORE SUCCINCTLY: It's a suspense action which hasith lots of assassins.

CLEARER: Honestly, ithe plot was complicated.

SMOOTHER: I found it difficult to catch up the story because there were so many characters.

For example, I was like why this guyCOMMENT: In very casual *spoken* American English, this is possible. If *writing* I recommend this wording: For example, I could not figure out why one person hoelds a grudge against that guy?another.

ALSO POSSIBLE: However, assassins wereseemed really cool.