or maybe he just genuinley doesnt feel good about his relationship w him????
I feel like it's a mix of both jealousy and genuine concern. He clearly likes the mc, but the relationship is so rushed and groundless, I would also be worried
*SPOILER*
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Nah. The best friend knows him more than anybody, because he's been in love with Hyuk since high school. He knows his tendencies, the kind of people he likes and how he fucked up and ignores every possible red flag. And he's doing all this not out of an unrequited love, but because he genuinely cares about Hyuk. He's not sabotaging he's really right about the feeling he's getting. Han is indeed hiding something from Hyuk.
The friend is trying to sabotage the MC relationship, I don’t care if you love the mc, what he is subtly doing, not out of love but out of jealousy, is shitty