The thing I like about TaeJu though, is that, even though he didn't realise he was in love with Euihyun
He treated Euihyun good. Like, he would never abandon Euihyun the way Kwon seems to want to get rid of Yeon-oh after his usefulness. Sure he will scold Euihyun, rightfully so because he is another very naive MC. But I feel like TaeJu's intentions are in a good place. Like, he does take his dads' words to heart and tries to understand Euihyun's feelings better.
Both Euihyun and Yeoh-oh are way too dependent on TaeJu and Kwon because they 1) both saved them, 2) are their first full sexual encounters, 3) have this odd relationship that makes them confused because they do act like lovers but there's a stipulation attached.
Honestly, I might just stay away from pearl boy for now just cause I know the author can be pretty graphic with their depictions of things.
And you're definitely right about Kwon and his rough play.