Still haven't finished the novel yet so I can't give definite answer, but there's three candidate. And the screentime is pretty much equaly distributed. Na Yuhan, Siwoo (I forget his surname), and Toto (I forget his real name). Anyway, I like Yuhan more.
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I think it might be because we can see Yuhan's feeling through MC, I can sympathize with him more. About Siwoo's feeling, it was a bit random to come, like why he fall for MC is not as clear as Yunseo's (or it might be because I haven't reach that point of reading yet). Also Siwoo's first half arc is SO BORING (personal opinion, please don't attack me)
Why did I write it "Yunseo" lmao, I mean Yuhan....
Main story ended up with open ending, we don’t know for sure who’s the true ML. But as celebration for manhwa serialization we got two extra stories, both for Yuhan and Siwoo.
Who's the male lead?