jeoneun naeyongi swiun yeonghwaneun jamageul kkeutkkaji bol piryoga eobseoyo.

Korean can have more than one topic/contrast marker in the same sentence.

• 저는 sets the overall point of view: as for me / speaking for myself
• 영화는 sets a narrower topic inside that frame: as for movies with easy content

So the sentence is structured something like:

• As for me, when it comes to movies with easy content, ...

The second 는 often adds a slight contrast too, as if implying for those kinds of movies (maybe unlike harder movies).

Here, 내용이 쉬운 is a clause describing 영화.

Inside that clause:

• 내용이 = the content/story is the subject
• 쉬운 = easy

So literally it means:

• a movie whose content is easy

The particle 이/가 is used because 내용 is the subject of 쉽다 inside the describing clause.

If you used 내용은, it would sound more contrastive or marked, not the neutral form learners usually want here.

쉬운 is the noun-modifying form of 쉽다 (to be easy).

When Korean adjectives/descriptive verbs come before a noun, they change form:

• 쉽다 → 쉬운 영화 = an easy movie

So in this sentence:

• 내용이 쉬운 영화 = a movie that has easy content / an easy-to-understand movie

내용 literally means content.

Depending on context, it can mean:

• content
• storyline
• plot
• what something is about

In this sentence, it most naturally means something like:

• the story/plot is easy to follow
• the content is easy to understand

So it is not saying the movie itself is physically easy in some abstract way; it is specifically the content that is easy.

Because 영화 is not the direct object of the main verb.

The main action is:

• 자막을 보다 = to watch/read subtitles

So the direct object is 자막을, not 영화.

영화는 is being used as a topic: as for movies with easy content...

That is why 는 makes sense here.

Literally, it means:

• to watch/read the subtitles until the end
• to keep following the subtitles all the way through

끝까지 means:

• to the end
• all the way
• through to the finish

In natural English, the idea is usually not just staring at the subtitles until the movie ends, but rather:

• I don’t need to rely on the subtitles for the whole movie
• I don’t need to keep reading subtitles all the way through

This is a very common pattern:

• verb stem + -(으)ㄹ 필요가 없다 = there is no need to ...

Here:

• 보다 = to see/watch/read
• 볼 = the -(으)ㄹ form
• 필요가 없다 = there is no need

So:

• 볼 필요가 없어요 = there’s no need to watch/read

This means lack of necessity, not:

• cannot watch
• must not watch
• do not watch

It specifically means don’t need to.

Yes, it is completely natural.

In Korean, 자막을 보다 means:

• to watch subtitles
• to read/follow subtitles while watching something

Korean often uses 보다 in situations where English might specifically say read. So even though subtitles are text, 보다 is the normal verb here.

Yes. In many real conversations, 저는 could be left out if it is already clear that you are talking about yourself.

For example:

• 내용이 쉬운 영화는 자막을 끝까지 볼 필요가 없어요.

This still sounds natural.

Korean often drops subjects and topics when the context is clear. 저는 is included here mainly to make the speaker’s point of view explicit.

They are similar, but the nuance is a little different.

• 볼 필요가 없어요 = there is no need to watch/read
• 안 봐도 돼요 = it’s okay not to watch/read

The sentence you gave focuses on necessity:

• I don’t need to watch the subtitles all the way through

That sounds slightly more explanatory or matter-of-fact.

안 봐도 돼요 is often a bit more like:

• You can skip it
• You don’t have to

Both are natural, but 볼 필요가 없어요 matches the idea of not needing something more directly.