Shiru and her harem y'all lmao

I really love this but there is something I eagerly wanna know like who is the one who gave the scarf to Hanjoon,is it Shiru?, Is the jealous Dora girl actually a guy, Does Sanghoo and Shiru confessed their feelings to each other and end up together? Does every guy in her friend group like her? and why does that pink headed four eyes need money? Does he have financial problems?

I know some of my questions are ridiculous but I'm actually curios lol ╮(￣▽￣)╭