That's how I would summarize this drama and it wouldn't be an exaggeration. There's blood spitting involved for the main leads in almost every episode. You could actually make this a drinking game and would end up so drunk after its 40 episodes that you couldn't pronounce your name anymore. Joke aside, I hate when dramas get repetitive but exactly that happened to TTEOTM.
There's just too much betrayal and blood spitting in it to be original anymore.

Minor spoilers ahead, nothing major
Also the main leads romance did not work for me and at first I couldn't quite put my finger on it. Why did my friends say, they kept watching for the main lead but I didn't feel the same? It wasn't his looks, nor his character. I liked him, but the romance nah, I even rooted for the main lead to end up with who knows who, just someone else than the FL.
And then I finally realized why this entire romance between main leads didn't work for me. I wasn't even convinced that what they felt for each other was true love. FL was sent back 500 years with the mission to kill him, then realize he's bullied and (probably) not the devil but rather the outcome of how people around him treated him. So what she's feeling is pity, yet hatred because he did massacre her entire family/clan. He's said to not be capable of feeling love so why should I believe he's developing romantic feelings for her? It might be more like having Stockholm Syndrome. Growing feelings for someone who treats you good, gives you food, clothes, cares for you when you're sick, even though they abused you in the past. Since no one else around him treated him like this, how should he know the difference between love and this warm feeling you get, when someone cares for you. That alone does not count as love to me. Even less since she kept backstabbing him, lying to him etc. They've been lying to each other the entire drama and when they didn't lie they didn't communicate at all and caused misunderstandings. It was really annoying and I won't even mention the end!
For me the drama was not worth it, despite a good cast, OST, CGI and costumes. I don't care about those when the story is so pathetic. I had high expectations and really wanted to love this drama, but the story and questionable romance totally disappointed and even upset me. I cannot recommend to watch.