I prefer this kind of harem where the girls are just in unrequited love and he doesnt notice,(am not a fan of Polygamy). I prefer him choosing only one. Lia(yoo-ara) is out since the girl is the one who broke up with him first and Julie is also out since MCs feelings are manipulated due to Desculane. I prefer Sylvia having love-hate feelings makes her similar to Chae Nayun in The Novel's Extra which someone I rooted for. Her gray colored world gain Color as she studies under him then curiosity leads to him being her muse then as she observes she falls in love. Minus points for not having another Male character with significant role. Pretty much most of them are harem members.