
Hecheng and Qiu to me are not lovers but also they're not so simple as just friends or boss/subordinate.
Unlike Hetian and Momo, Hecheng did not have the privilege to meet Qiu when they were much younger and explore what could be early on.
From the story we know that Hecheng meets Qiu when they are older and it's safe to assume the former was already heavily involved and busy with the family business. Not to mention Hecheng's constant worry over Hetian, romance was probably at best just a fleeting indulgence for Hecheng. I'd say it was the same for Qiu too. He likes his women and fun but his main focus is obviously his career as a bodyguard more than anything.
They then meet, probably a little spark between the two but they just ignore it. Hecheng finds himself a good loyal bodyguard and Qiu dream* job with good pay and easy leisure(lol). Winwin.
Along the way, the initial spark between the two simmers and grows despite everything.
They know they have this bond, whatever it may be and unspoken but it's there. Hecheng will never let Qiu leave (Tian brothers are extremely possessive after all ;D) and despite Qiu's grievances and threats to quit (lol), he'll never leave him either.
It's beautiful but also kinda sad as I doubt they'll ever be so open and obvious like Hetian and Momo. But they are together in their own way that works for them. Under the guise of boss and bodyguard.
Anyways, I obviously want more He Cheng and Brother Qiu content! lol.

I think it's just a coincidence from Fargo ( or maybe not) but Byul really reminds me of one of Jane Austin's novel heroine 'Emma' and 'Cher' from Clueless (also inspired by Jane Austin's Emma). The characters are basically pampered, spoiled and quite naive, all arguably negative traits but then they're also endearing, kind and mean well and make you want to root for them.

Byul's probably the prettiest alpha ever drawn. I wouldn't be surprise if the author does a switcha-roo and he is really a super omega or some kind of hybrid of both even if the author decides to go that route. HOWEVER seems like the author also has a goal of pairing all the omegaverse genders together so most likely Byul and Jiwoo will stay alphaXalpha too.
Jaekyung could've said the right thing but he went and said the wrong thing looll.