I started watching it due to actress playing FL, I have seen her in a couple of shows before and she does a decent job. And here as well she was the only good thing about the show, she is also central character around her the entire plot revolves, other characters including ML had nothing much to do, character or story wise.
Entire drama is 90% filled with kdrama tropes, if you are an avid kdrama fan, you can pretty much predict the next scene and the dialogues and how everything is gonna unfold. Except that grandpa part, which was a little twist I didn't expect so that made me give an extra rating as 5/10, otherwise this is 4/10 at most, ost and bgm is decent, matches the tone of the show, also the periodic part of the show wasn't boring, which usually is the case in such dramas.
ML was your very typical character in a kdrama, childhood trauma, is rude and cold for no reason, then falls for FL but denies and hides his emotions like a manchild, and then completely changes his behaviour. Completely cliched.
Other characters are the same, best friend/servant to the FL, BF/secretary to the ML, then a girl in office who pines for ML, evil stepmom, bratty/flirty younger bro to ML who'll flirt with his brother's wife/gf, a grandpa bullying his grandson to marry etc etc. Pretty much everything is cliched to the core.
If this is gonna be your first kdrama, or you are very new to the kdrama world, only then watch it. Otherwise not recommended.