It wasn't his dream. He just wanted yo do that job so he could earn more money. You could see that in manhwa he was particularly remembering about that earning more money part.
And she didn't stopped him to take an actual job rather she said not to do extra jobs as he is studying and doing some other jobs.
Wasn’t a job sure but a higher paying position at his current job. She borderline threw a tantrum at his job when she thought he took position after she told him not to so yes she did stop him. he wanted to and said he’d think about it but I guess her no meant no right? Nah that’s some unhealthy controlling type shit she shouldn’t have any say over his job, income etc especially when she makes wayyy more than him as a partner
It’s literally just having basic respect for your partner and their life choices.

I like the art and ml is sweet as hell but tf is her problem?? Bitch thinks she can stop my guy from following his dreams! That moment was really off putting