No he is not.
oh
It kinda sucks tho right I know Ren acts like an asshole now but trust me he is the most helpful person EVER (I read the novel). He's the reason why Elena will always succeed. REN IS AMAZING AND BEST BOI
SPOILER!!!
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He's not the male lead but he owns the 75% of Romantic scenes with Elena. Honestly he helped and loved Elena soo much to the point where he didn't care that Sian would take the credit
AND ALSO, I can say that he had 75% of the Romantic scenes because it came to the point where Elena's POV said this,
"Elena's face turned red when she faced Ren, recalling the previous hug. Her heart was pounding with an awkward and embarrassing heart"
IS THE COUSIN THE MALE LEAD? YES PLEASE