I think the scene where everyone watches the videos of Jiho and Cheonyoung locks Jiho in as the final ML and Dani's most appropriate partner.
Inso's Law is a series of arcs that force Dani to deconstruct her own fears and prejudices about the world as a story. Of course, these fears are fed by the fact that she's right about everything. Key in all of this is Dani's deep fear of anything changing because change could mean losing everything. Over the course of the manhwa, Dani slowly comes to realize that the change she inspires in those around her is actually a powerful and good thing that leaves a mark for the better in the people around her.
With this in mind, while watching the videos, Cheonyoung is the one who comments, "Isn't it okay to stay the same? I like that." This comment is framed as a promise that gives Dani hope. It provides her with temporary stability and, at the time, it's what she most desires. The promise that things will stay.
However, this is not what she benefits from as the narrative goes out of its way to show over and over through each consecutive arc. Dani needs to recognize her own agency in the world to change and be changed. Examples include her choice to stay with Yeoryung disrupting the webnovel, Choi Yuri's entire kidnapping arc, and her relationship with Yeodan.
Then, there's Jiho. In reaction to the video from middle school, Jiho is described by everyone as someone who changed. He was "more handsome," "expressionless," and "better." In sum, he was the unattainable main male lead. The dramatic change he went to from someone cold and aloof to someone able to read the room, protect others, and allow himself to be made fun of and look silly and vulnerable all pushes him out of the role of main male lead. Dani herself thinks to herself that she was too quick to assume he was the main male lead or that he acts "like a protagonist" rather than "is a protagonist" (which is how she often things of Yeoryung, Cheonyoung, and Ruda.)
The change Jiho worked hard for so he could be seen as a real person by Dani is what makes him her ideal partner. Their relationship is the ultimate resolution to her character arc. In the end, when she opens her eyes to all the people she's changed, she has been most important to Jiho's life and, in return, he has been there for her time and time again, not as a golden-hearted protagonist or reformed male lead, but as a teasing, kind friend.
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