I guess my opinion is unpopular here, but here I go

Overall it had cute moments, and good sex scenes including the BDSM (which isn't "ew" like some.

However, I didn't feel the manga dealt with the past and present well. For instance, the past was shown for us- readers to understand the background but it didn't really tie up with any of the character development or as a tool for the characters to understand each other.
Too much drama that was predictable, and since I've read so many manhwas and watched K dramas, it was too repetitive. But, if I read it as my first manhwa, I might have liked it more I'm sure. honestly, and sunbae and repetitive drinking scenes are enough for me.