Hellbound is not the least bit romantic but the atmosphere is the same..
Dark
Gore
Supernatural
Mystery, fantasy and lore

We werent really sure what was going on but all is slowly revealed.

Same Revenge plot.
Childhood friends/sweethearts.
Secret/not so secret identity.
A little bit of slap and kiss.

For me, Hua Jai Teuan was more tame than Hua Jai Sila. I think HJS is a better option in terms of chemistry, skinship and drama. Also, I like for my ML to obsess over their FLs. Tor kept following and messing with Min as if he thought of nothing else. In HJT the male lead had a 'Friends with Benefits' (basically f'buddy) with another girl....(sickening! bleeah!!)

Both have tortured romance based on revenge. Men who become obsessed with their women. Both men also wanted to keep the FL as mistresses with their fiance/wife.
Both men also sought to keep the FL captive.