Evan

Starting to end was good as he is demon & she is adopted girl now belongs to rich family & she is the CEO. When he trys to make a deal with her but due to an incident he knowing saves her but his tattoo (which is the power source to him) transfers to her. So now he definitely wants her in his side becaz of tattoo but she also needs his power as she in danger because of her family member who need her to die becaz of her position to occupy. Her Grandma is fully supported to her & who adopted her (in end they show she is the 1 who killed her biological parents becz of her wrong doings exposed). Once grandma dies & her Will was, Do hee will be the Chairperson but she needs to marry. So she marries the demon & by contrast marriage ( but it was an nice sequence) then he understands her very much as he himself sacrifice him to save many times. Later at last he comes to know the he is the one who took her parents life as they made a deal with demon ( her papa made the deal to saves his wife & do do hee).Once he knows this, due to guilt of his deal to kill her parents, So he left her. Also there is past (200yrs back) for him where he loves Wosim (govt courtesan) but they village people kills her by some means. Once he knews this, he kills all the people & himself. Aftersome time in later sequence, they shows that wosim was the present dodo hee. So the girl he loves now & then is her only. Then in 1 sequence he dies in order 2 save her but later she make wish & he himself reborn at final. Now both had happy ending.

Overall the plot is fiction, fantasy,power transfer to her from him, marriage contract(nt that much), Marriage sequence, love in past, he saves her many times from death, better character understandings from him to her, both struggle a lot each other to be together after marriage, good character development over each other, marriage takes place before love, last sequence when he saves her, he sacrifice himself to die to save her & then she wish & he reborn, good Ending.