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I loved the drama. But they changed my favourite part - Bo Gyeom. The drama was true to the fact that he was secretly sinister. That he's the mountain spirit who cursed Hae Na's family out of revenge. That he'd do questionable things against the MCs. But ...

In the webtoon:

• It takes a while longer before Bo Gyeom seems suspicious. It's a twist. 
• Like the drama, readers are left under the impression Bo Gyeom means the MLs harm. But the ending reveals one more twist. Bo Gyeom found out about the misunderstanding right after casting the curse. Because of his mistake, he was stuck watching over Hae Na's family.  
• Feeling guilty too, he spent centuries playing cupid, hoping to get Seo Won and Hae Na to fall in love again. There's even a funny chapter that shows his miserably failed attempt on two of their previous lives (in one, they were born the same gender, while in the other, they hated one another). 
• Bo Gyeom has way more scenes with the ML. He's really close to him. Given all of this, for some time, we're left reeling from the fact that Bo Gyeom might have been faking friendship all this time, before we of course find out that all of it was real and he does genuinely love Seo Won.