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In front of others, she is a doctor who saves lives and heals the wounded. Behind others, she is the light in the darkness. In person, he is a special policeman that everyone loves, but in person, he is a lover who only wants to protect her for the rest of her life. In front of people, she is a detective with a clear eye, and behind people, she is her best friend who hides her whereabouts. In front of people, he was a killer that everyone feared, but behind people, he was the guardian who dealt with her aftermath. Although her name is cold, her heart is warm. Although he treats others gently, he only wants to protect her. She seems to be ruthless, but she is always by her side. Although he kills people like crazy, he just wants to fight for her.