Wait I’m so confused abt the ending also I lowk forgot who that man is 💀

if you're talking about that black haired actor across juheon, that's dohu's bully from HS shown in S1 and seo juheon's co-star who made trouble for him a few chapters back. that trash was the one who intentionally made a lot of NGs and excuses so he could hurt juheon in the previous scene recording. just like he's doing now. using acting and pretending to care to cause trouble.