ju-ingong pyojeongi jayeonseureowoseo seulpeun jangmyeoneseodo moriphage dwae.

Both are possible. 주인공 표정 is a more casual, compact way of saying the main character’s facial expression(s).

In Korean, 의 is often dropped when the relationship is obvious, especially in everyday speech.

• 주인공의 표정 = the main character’s expression
• 주인공 표정 = same idea, just more natural and conversational in many contexts

So here, 주인공 표정이 자연스러워서 means because the main character’s expressions feel natural.

Because 표정 is the subject of 자연스럽다.

The core part is:

• 표정이 자연스럽다 = the facial expression is natural

Here, 이/가 marks what is being described as natural. So 표정이 is not an object; it is the thing that has the quality of being natural.

It can effectively mean either, depending on context.

Even though 표정 is singular in form, Korean often does not mark plural unless it is really necessary. In English, we might naturally say expressions in a sentence like this.

So here, 주인공 표정이 자연스러워서 can be understood as:

• the main character’s facial expression is natural
• or more naturally in English, the main character’s expressions look natural

It comes from the adjective 자연스럽다 = to be natural.

Conjugation:

• 자연스럽다
• 자연스러워서

The ending -아서/어서 often means because or so, connecting this clause to the next one.

So:

• 자연스러워서 = because it is natural / since it feels natural

In this sentence, it gives the reason for the immersion in the next clause.

Here it means because.

The sentence structure is:

• 주인공 표정이 자연스러워서
• 슬픈 장면에서도 몰입하게 돼

So the meaning is:

• Because the main character’s expressions are natural, you/I end up getting immersed even in sad scenes.

Sometimes -아서/어서 can sound more like simple connection, but in this sentence the cause-and-effect meaning is the natural reading.

It breaks down like this:

• 슬픈 = sad
• 장면 = scene
• 에서 = in, at
• 도 = also, even

So 슬픈 장면에서도 means:

• even in sad scenes
• or also in sad scenes

In this sentence, 도 has the nuance of even, which emphasizes that the immersion continues even during sad scenes.

Because 슬픈 is the adjective form directly modifying 장면.

• 슬프다 = to be sad
• 슬픈 장면 = a sad scene

This is the normal way to describe a noun with an adjective in Korean.

• 슬퍼하는 장면 would mean something more like a scene where someone is being sad / showing sadness
• 슬퍼서 장면 is not correct Korean

So 슬픈 장면 is the straightforward phrase for sad scene.

몰입하다 means to immerse oneself in something, to become absorbed, or to get drawn in.

It is often used for things like:

• movies
• dramas
• books
• games
• performances

So in this sentence, it means the viewer becomes deeply engaged in the scene.

This is an important nuance.

• 몰입해 = immerse / get immersed
• 몰입하게 돼 = come to get immersed / end up getting immersed / naturally find yourself immersed

The pattern -게 되다 often expresses:

• a change of state
• something that happens naturally
• a result that is not framed as a deliberate choice

So 몰입하게 돼 suggests:

• you end up getting immersed
• you naturally get drawn in

That sounds softer and more natural here than a blunt 몰입해.

Korean often leaves the subject unstated when it is clear from context.

In this sentence, the hidden subject could be:

• I
• you
• the viewer
• people in general

That is why English translations may vary:

• I get immersed
• you get immersed
• it draws you in
• viewers get immersed

All of these fit the Korean sentence depending on context.

돼 is the casual spoken form of 되다.

So:

• 몰입하게 돼 = casual, conversational
• 몰입하게 돼요 = polite everyday speech
• 몰입하게 됩니다 = more formal

This sentence sounds like something you might say in a casual review or conversation about a drama or movie.

Yes, that is a very natural translation.

Because -아서/어서 plus -게 돼 often creates a smooth cause-result feeling, English can translate it in several natural ways:

• Because the main character’s expressions are natural, you get immersed even in the sad scenes.
• The main character’s expressions are so natural that you even get immersed in the sad scenes.
• The main character’s expressions feel natural, so you end up getting drawn in even during sad scenes.

All of these capture the meaning well. The Korean itself is flexible enough to allow different natural English phrasings.

표정 primarily means facial expression or look on someone’s face.

It can imply emotion, because facial expressions show emotion, but the word itself is specifically about the expression on the face.

So in this sentence, the idea is that the main character’s face looks natural and believable, which helps the viewer become immersed.

Both 에 and 에서 can relate to location, but they are used differently.

Here, 장면에서 is natural because it means something like:

• in the scene
• within that scene/context

It gives the sense that immersion happens while watching those scenes.

Then 도 is added:

• 장면에서 = in the scene
• 장면에서도 = even in the scene / also in the scene

So 슬픈 장면에서도 means even in sad scenes in a very natural way.