
okay i am stupid ..what online store ?? how does he want to make a online store when he is poor ..sorry but i have no idea how these things work ..can somebody enlighten me ..

Chapter 3. When Sangjin is asking questions. Hajin says he is not a student. In chapter 21 in the dream/flashback Hajin was done with school.
When Jaehee broke up with him. He must had stopped modeling, quit college or never went to college. Also, he lived in an apartment that was under his sister’s name. I think she said she gave him money also. She was going to help him with set it up.
In the Korean Neets is not said, that is exclusive to Tapas. In the Korean, French and Japanese he is looking for a job.
He has been setting up his online store as the story processed. Chapter 29 would be one place.
He has money with his job as a fashion designer and Hangyum has offer Hajin, his money in chapter 35.
Maybe he had kept some money from when he had another jobs. We are not sure when he quit modeling and we don’t know when his last job was. I don’t think he was out of a job for too long before he became a stylist. If this does not help you let me know. I think this is what you were asking.

what the actual shoujo fuck ... does she gets fucking plastic surgery every time she removes her glasses .. she literally looks the same ... and the guy who is her classmate & works with her gets his eye blind ..along with hearing issues ...every time he sees her at cafe ...

Might be her overall feel? Like her clothes, and attitude change. He did originally mistake her for her "real self" initially, but took her at her word that she was another person, and her personality as so different he didn't question it. People can look really different with the right wardrobe, hairstyle, and a personality change.
Look up Tom Cruise in Tropic Thunder. All it really was, was a wardrobe and personality change, but you'd have to study the face a bit. And even then you probably wouldn't guess he was Tom Cruise, especially if he introduced himself as a different name.
seriously every time i feel down .. i come for this manga it really lifts ones mood...