Spolier ahead .
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If u don't like spoilers don't read them .
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He is not a f* boy . He is sincere . He didn't allow himself to love him bcz he was young and bcz of his works for his mom . It is so complicated. DH is a nice guy but he entered the Mc's house not just to tutor him. DH is just afraid that the past will come to bite him and that Mc will never forgive him . When he say i'm not allowed to love u , it is not some empty words. DH is amazing he is the most mature and sexy Alpha ever, but given to his nature of surpressing his emotions and the fact that his job is to monitor Mc . It gave him no way to love Mc freely. If it were not for the fact that he works under Mc's mother we would have seen a diffrent approach of his part

So is it just me or did Duhyun (ml) totally change character? He was my favorite in omega complex bc he was so mature, sincere, easy going. He never tried to push the mc there into some mind game or make or play fuckboy games. Clearly the author knows this and tries to explain it away with 'im not as good as you think'
But cmon, do they just want to write a story about a fuckboy? Then use a different character ┗( T﹏T )┛