I’m not exactly getting the vibe that he’s a bad guy as yet. He didn’t submit the photo as his because he didn’t take it, so it shows he doesn’t steal another’s work as his own. But I wonder if he’s feeling a sense of jealousy, inferiority, or disappointment because the professor picked Yeseul’s photo over his. We won’t know until the author fleshes him out in later chapters.
Consider how Heewon and Miyoung, though antagonistic, grew into rivals rather than villains. Miyoung, initially a minor antagonist, accepted her flaws and her sense of inferiority, and so was able to be honest with herself and stepped out of the tournament.
By showing different sides to Heewon, we see that though she’s prideful, she’s also fair, generous, and has a clumsy side. She’s also got her own set of insecurities.
Also want to point out the insightful comment by
@Dess 👍✌️