help me

I'm searching for a manhwa that I read last year but I don't remember the name.
The uke and the seme are in university(they start already as a couple) one is in fashion department the other in some like of martial art department.
I remember the plot was that the uke had to make clothes for his model for a school project, he wanted his bf to participate in it but the seme was insecure of his weight because the uke's exes were all bone skinny and people talked shit about them. So he decide to lose weight() for the runaway.
I also remember they were so in love with each other and had an healty relationship. It was uncensored...
The uke is skinny as hell and has greenish and kinda long hair, the seme is buff and has light brown/blonde hair.