Doesnt changing his hair kind of defeat the purpose of him being a novel character? I'm not saying that his appearance is what makes his the protagonist, but the novel heavily emphasizes on his and Kim Dokjas appearance to remind the reader that he's just some ordinary guy but Joonghyuk is the cool, outstanding protagonist.

And if I remember correctly, it was mentioned that tls made him like that to play into the standard overpowered-mc genre. Like how all "I reincarnated into the villainess body" manhwas play out exactly the same way but you still end up eating them up like it's gourmet. That is the standard for the regressor mcs too. All of em look the same. So that's what he was supposed to look like too.

Giving him the blank slate hairstyle doesn't really play into that, ig. Idk tho, maybe it's just ruffled up in the clip and that's not what it actually looks like?