I’m going to re-post my response here with revisions. @peachietime said,

But didnt Danoh learned that Haru can change a Stage that’s why she keeps on finding him to change her faith? That’s the whole point of finding Haru to begin with so Haru has always had that unique ability.

Yes. She guessed that he could change her fate however they both didn’t the rules on how to change her fate so they’re learning by trial and error. And that’s what we’re SUPPOSED to discern in these episodes: the steady progression of Haru’s powers.

That’s what DanOh meant in Chapter 5 at 23:04, when she said she was good at the game even without the answer key. Like in a lab experiment, she can find a solution to her problem with a) repeated and varied attempts, and b) lessons from her mistakes. (Ha! I’m beginning to realize now that the stage setting of each accident/encounter are actually significant…. but I’ll leave that discussion for another day.)

DanOh is experimenting on her own life. And Haru is her catalyst or the chemical required for the change. She and Haru must calibrate how much of his presence (or substance) is needed in each trial to change DanOh’s future without, metaphorically, blowing up other people’s life experiments or their fates.

Do you get the direction of the romcom now? The screenwriter isn’t just throwing random and repetitive accidents into the plot. There’s actually reason to it, and YOU, as mindful (not mindLESS) viewers, are supposed to figure this out.  Just like character Haru, you are meant to discover where this story originate and where the story is heading.

I wasn’t joking when I said earlier that this kdrama is META.

So here’s the progression of their understanding (and ours) of Haru’s powers, as I see it.

1. From the staircase accident: DanOh realizes that Haru’s presence can change outcome slightly.

The accident still happened but she avoided a disastrous and painful broken leg. She only grazed her knee.

Lesson learned: The addition of Haru in the situation can change outcome. Haru is an unknown “variable.” He isn’t static because he’s a nameless extra.
Next step: To find out how much change can he bring about?

2. From the lab accident: inconclusive report.

The result of the experiment was half-and-half. Accident still occurred as she previewed it but this time only one tower of boxes fell, Jooda was slightly injured and the school alarm didn’t set off because Haru was in the storyboard and was able to block her tower of boxes. Greater damage was again averted.

Lesson learned: The inclusion of Haru in the storyboard means he can MOVE around and change some features of the preview. As a nameless extra, he’s not locked in, like DanOh is locked in, so he can move and change things.
Next goal: Change DanOh’s minor character set-up in the manhwa.

Remember: according to the manhwa, DanOh is an extra, “female, 18 years old. Baek Kyung’s fiancée. Her body is weak due to a heart condition.” DanOh wants those changed. She didn’t want to be Kyung’s fiancée and she didn’t want to die.

3. From the beach accident: But Haru didn’t move.

He was again in storyboard. She sought his help to change her future. She had a destiny rock and she wanted to Haru to stop her from going into the water and retrieve the destiny rock that Kyung would throw. If he stopped her then she would have conclusive proof that Haru could change her future.

But he stood there like a rock. (lol. I’m telling you now the VENUE of each accident is significant to the plot, too. Pay attention to it)

DanOh cried because Haru didn’t jump in to save her. He was like anchored to the rock while she was wading in the shallows and asking him to help her.

Viewers assumed he was immobile because he was an extra and had no choice but I told you, ladies, no. That assumption is faulty.

He didn’t move because he personally didn’t WANT to move. Why? I don’t know.

Maybe he wanted her to get that rock herself. Maybe he was jealous because he had *experienced* this scene from a previous life. Maybe he sensed that she should get that destiny rock.

The point is he ALLOWED her to go in the water; he was NOT immobilized.

The important discovery TO THE VIEWERS here was Haru’s choice. It must be Haru’s choice to change her settings.

He saw the writing on the destiny rock, and her correction of her wish from the pre-set “make Kyung fall in love with me” to “make me live.”

She’d given up on constructing the tower of stones because she saw it was futile. To her, the falling tower of rock symbolized her vain attempts at changing her life. Whatever she did, it would all just fail, so she might as well give up.

But she didn’t see Haru complete the tower for her. And she didn’t hear him calling her name.

Lesson from this incident: Haru must decide to intervene.
Outcome of his non-intervention: DanOh whacked Kyung’s back and walked away from him. This is the start of her breaking free from Kyung in the manhwa. Her action wasn’t originally part of the preview that she saw. But her walking away became an illustration and part of the manhwa after she did it.

Haru was shown checking the manhwa that he’d brought with him to the beach trip.

4. From the forest incident: Haru can step in and replace Kyung.

Haru wasn’t in storyboard. In the preview, it was Kyung who rescued her in the forest. But unlike his non-intervention in the beach scene earlier, Haru literally and metaphorically stepped into Kyung’s role and came to find her in the forest.

Lesson learned: Haru must consciously decide to involve himself in DanOh’s crisis is required. He must desire and will the change to make it happen.

DanOh didn’t tell him about this preview of her lost-and-found Stage because she wasn’t relying on him anymore. After he disillusioned her in the beach with his inaction, she assumed that he wasn’t the KEY or the required catalyst in her life.

That’s why she studied all night to memorize the map. She assumed that she had no one but herself to depend on to change her fate.

But Haru knew exactly when and where to come in. He came in lieu of Kyung.

Another lesson learned: Haru doesn’t need DanOh to tell him about the preview.

And still another lesson learned: By following the storyboard, his intervention only displaces, delays and postpones the narrative. For instance, Kyung still delivered his lines but a day late. He still bellowed at her, “Where were you? I looked all over for you!” although it happened the following morning.

Important revelation: storyboard can be delayed. The characters can be DISPLACED or replaced. The lines can be POSTPONED.

Are you following me still? 😂

But changing storyboard has repercussions. Since Haru begins to change the story himself, some things are disappearing in her life, for example, her swing and plant. More importantly, Haru himself is getting hurt because of the change.
For instance, Kyung pushed him against the shelf and he bloodied his forehead.

DanOh realizes that she doesn’t want Haru hurt because of her ambition to change the set-up of her minor character. So she begins to avoid Haru and she stops asking him to change her life.

Until the amphitheater scene…

5. Amphitheater Stage (And this is where I am now. You’re ahead of me, lol)

In the amphitheater scene, we see that Haru can totally go off-script.

It’s as if he’s broken the “fourth wall” in the comic book world. He went inside the Stage UNINVITED and unscripted, and punched and derided one of the major characters. In effect, he wrote a role for himself when he wasn’t even an important “extra” in this story.

Lesson learned: he can actively participate in the manhwa whenever he wants to, and he can break the continuity. Look at these:

one, he wasn’t even in the storyboard for this Stage but he came out of nowhere to punch Baek Kyung.

two, he chose to intervene without DanOh’s approval. DanOh didn’t even know this Stage was coming. It just happened and Haru showed up at the right time.

three, he was stealing the main character’s girl.

four, he didn’t play by the rules of the manhwa world. He walked in the Stage and essentially informed the lead character that he was only a dumb character saying lines and couldn’t remember anything beyond that. Haru was belittling Kyung when he told him, “You won’t remember even if I tell you. Because the scene is changing soon.”

And last, he was stepping to get the girl because Kyung didn’t know how to treat her better.

Do you see all that?

Whereas Haru had been willing to take it easy and do little changes for her, he became a more active and, should I say vigilant? participant in DanOh’s life ever since he saw the keychain.

Again, I already told you about this, ladies. 😂 The keychain triggered him. When he realized that there was a new keychain to subvert (or replace?) his old keychain, he was pushed to go look after this new keychain and demand it back from Kyung.

He was contently drawing DanOh with his vintage hair ornament. But when he consulted the manhwa and read that Kyung had trampled on the keychain given to him by DanOh, he tore off his sketch and went in search of Kyung.

To me, that was his turning point in his evolution. He wasn’t going to be an ordinary, nameless extra. He was going to be an “extraordinary” extra, lol.

It’s significant that he first revealed his name to Kyung. “I am Haru.” After all, Kyung was the first one to notice him. Remember their library meeting when he bumped Kyung’s shoulder after he shouted at DanOh for stalking him in the library? That time, Kyung asked him who he was and he had no response. Haru didn’t have a name then.

But now, he has a name.

Just like in that library encounter, he saw Kyung shout at DanOh about the keychain and humiliate in front of everybody to the point that she cried.

And this time around, when DanOh was caught in that Amphitheater “Stage” with Kyung verbally abusing her again, Haru was set and prepared to punch him. He wasn’t going to let Kyung distress DanOh again.

And that’s why Peachietime, it isn’t sufficient to simply know that Haru has this ability to change her fate.

Duh. 😂 Everybody can see that.

But we’re supposed to get that his ability is unfolding and developing. It’s a learning process, a “trial and error” process as I said, for the characters as well as the viewers.

DanOh and Haru are both seeing what works and doesn’t work in their great experiment to free DanOh from her pre-determined and miserable fate.

Now, let me try to finish this Episode 5 (Chapters 9-10).