That is a negative view or maybe not understanding Hangyum. This has no spoilers.
In chapter 12, Hangyum asks to be a couple and Hajin panics making them sex friends. Chapter 30 how he acts and asks Hajin to be free on Wednesday. Chapter 35, Hangyum is tired of them being sex friends and wants a serious relationship with Hajin. He was even serious about the relationship in the past (chapter 23). Hangyum has always been serious about dating Hajin and what happens in chapter 51 does not surprise me from how I come to understand Hangyum.
I guess this a hint of a spoiler that he does not say “we are fuck buddies” or “just a physical relationship.”
Make sense.
He better not be a jerk and say physical relationship! ヽ(`Д´)ﾉ