Inconsistent characters

Right now I am enjoying watching this drama and I laugh most of the time eventhough I see bunch of red flags with this ML. Its very good drama but the thing that bothers me most are some characters here especially the ML, does he have split-personality disorder? One time he's like a narcissist egoistic immature devil, and then after a minute he's just like an angel has possessed him? I don't understand his personality here. Also for the second lead female, at first she doesn't like ML, and then when she knew he had married she suddenly wants him? Really? She has this narcissistic attitude like the ML. This scenario I'm rooting for the Main female and Second male because there's no problem with their personality and character and they have smoother relationship. In that case I think this drama don't take this seriously because in reality there's no such things, the characters here are very unrealistic. But I did find this entertaining and funny. Will finish the story anyways.

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